What Causes Hair Loss in Dogs? A Scientific Analysis of Seasonal, Hormonal, and Disease-Related Causes
- VetSağlıkUzmanı
- 5 days ago
- 24 min read
What is Hair Loss in Dogs? The Difference Between Normal and Abnormal Hair Loss
Hair loss in dogs is part of the body's natural renewal process. Each hair follicle on the skin has a specific life cycle, consisting of growth (anagen) , rest (telogen) , and shedding (exogen) . While some hair loss in dogs is a purely physiological process, excessive or patchy shedding may indicate an underlying medical problem.
Normal shedding can increase at certain times of the year, particularly peaking in the spring and fall as a "seasonal coat change." Dogs shed their thick winter coats in the spring and their fine summer coats in the fall. Short-haired breeds (Beagle, Pug), double-layered breeds ( Husky , German Shepherd ), and breeds with dense undercoats experience this cycle significantly.
Abnormal hair loss, on the other hand, manifests as intense, localized, symmetrical hair loss accompanied by redness and itching . If skin breakouts, irritation, crusting, dandruff, a foul odor, or persistent redness are present, this is not simply physiological hair loss.
In normal hair loss, the skin is healthy, the hair is shiny and there are no gaps. In abnormal hair loss:
feathers become matted
Patch-like gaps appear on the body
The dog constantly itches
skin structure deteriorates
Therefore, dog owners need to distinguish whether shedding is "normal" or "a sign of disease."
Types of Hair Loss in Dogs: Seasonal, Hormonal, and Skin Problem-Related Shedding
Hair loss in dogs falls into three main categories: seasonal , hormonal , and dermatological-disease-related shedding . Each category has a different mechanism, set of symptoms, and treatment protocol.
1. Seasonal Shedding
This shedding is completely natural and increases at certain times of the year. It is especially seen in breeds with double-layered fur.
Features:
There is no itching
There is no redness, sores or crusting on the skin.
The feathers fall out evenly
It increases more in spring and autumn
The dog is energetic and healthy
Dandruff can only occur if there is neglect.
This shedding can be managed by increasing the frequency of combing .
2. Hormonal Hair Loss
Hormonal disorders are one of the most common causes of abnormal shedding in dogs. The following diseases are particularly prominent:
Hypothyroidism (Thyroid Insufficiency)
Symmetrical hair loss
Darkening of the skin (hyperpigmentation)
Cold and dull skin
Excessive weight gain
Slow movement, weakness
Cushing's Syndrome
A swollen, “sagging” abdomen
Thin skin
Symmetrical hair loss
Excessive water drinking and frequent urination
Estrus/Testosterone Imbalances
Shedding in female dogs during the heat cycle
Hair thinning in men due to testosterone disorders
Hormonal shedding is usually non-itchy , but is characterized by its symmetrical nature.
3. Hair Loss Due to Skin Diseases
This category of flaking is accompanied by itching , redness , flaking , foul odor , injury , bleeding or crusting. The most common causes are:
Allergies
Food allergy
Pollen, dust, mite allergies
Sensitivity to household chemicals
Itching and redness are evident in allergies.
Scabies (Sarcoptes / Demodex)
Severe itching
Patchy hair loss
Redness around the ear, elbow and abdomen
Thickening of the skin
Demodex is usually seen in young dogs.
Fungal Infections (Dermatophytosis)
Circular hair loss
Flaky appearance on the skin
It can infect humans
Bacterial Dermatitis
Local infection foci
Pustule, crusting, bad odor
Flea and Tick Allergy
Heavy shedding in the tail and lumbar region
Itching and sores at bite sites
4. Hair Loss Due to Nutritional Deficiencies
Omega-3, zinc, B complex and amino acid deficiencies lead to serious hair quality problems. This is common in dogs that consume low-quality food.
5. Hair Loss Due to Stress and Psychological Factors
Change of home
Noisy
Separation anxiety
New animal/human adaptation at home
In some dogs, stress directly triggers hair loss.
6. Hair Loss Due to Aging
In older dogs, the hair renewal rate decreases and shedding may increase. Although this is physiological, hormonal problems are common in older dogs and should not be neglected.
Common Causes of Excessive Hair Loss in Dogs (Nutrition, Hormonal, Skin Diseases)
Aside from the completely natural seasonal shedding in dogs, excessive , uncontrolled , patchy , itchy , or foul-smelling shedding usually indicates an underlying health problem. The following causes of dog hair loss are the most common in veterinary dermatology and endocrinology clinics.
1. Feeding-Related Hair Loss
The dog's coat structure is largely related to the quality of its diet. Low-quality food and deficient nutrients weaken the coat structure.
Effects of deficiencies:
Protein deficiency: Feathers become dull, break off and brittle.
Omega-3 deficiency: Dandruff, dryness, itching increase.
Zinc deficiency: Flaking and crusting around the eyes and mouth.
Vitamin B deficiency: Hair growth slows down and hair loss accelerates.
Therefore, the most common environmental cause of hair loss is poor nutrition or cheap, low-ingredient foods .
2. Hair Loss Due to Hormonal Disorders
Hormonal diseases usually cause symmetrical and non-itchy hair loss.
Hypothyroidism (Thyroid Insufficiency)
Feathers break easily
The skin is cold and thickened
Symmetrical hair loss in the neck and trunk area
Cushing's Syndrome (Excess Cortisol)
Shedding in the belly area
Thin, sensitive skin
Abdominal fat and muscle loss
Estrus/Testosterone Imbalances
General shedding in females during hormonal periods
Hair thinning with testosterone imbalance in men
3. Hair Loss Due to Allergies
Allergies are the most common cause of itchy shedding in dogs.
Types of allergies:
Food allergy
Pollen, dust, mite allergies
flea allergy
Chemical (cleaning materials) allergy
Symptoms: Itching, rash, ear infections, foot licking, heavy shedding on the tail.
4. Hair Loss Due to Parasites
Parasites cause shedding through both itching and irritation.
Sarcoptes scabies: Severe itching and bloody sores
Demodex mange: Patchy shedding, common in young dogs
Fleas: Shedding + crusting on the tail
Ticks: Local shedding and infection
5. Fungal Infections (Dermatophytosis)
Fungal infections usually manifest as a circular opening. This is important because it can be transmitted to humans.
Symptoms:
Round feather gaps
Flaky structure on the skin
mild itching
bad smell
6. Stress and Psychological Factors
In some dogs, stress directly triggers hair loss.
Situations examined:
Change of home
Separation anxiety
Noise, fear
New animal/human at home
In stress-related shedding, the skin is usually intact, but the hair is thin, weak and fragile.
7. Hair Loss Due to Aging
In older dogs:
The rate of feather regeneration decreases
Hormonal regulation may be disrupted
The skin barrier weakens
For this reason, shedding may be more noticeable in older dogs.
8. Wrong Bathing and Care Routines
Too frequent bathing: dries the skin → increases shedding
Wrong shampoo: pH imbalance → itching
Inadequate combing: accumulation of dead hair → shedding crisis
Hair Loss Due to Major Diseases in Dogs: Hypothyroidism, Cushing's, Allergies, Mange and Fungus
The most critical part of excessive hair loss is shedding caused by disease . This category is completely different from normal shedding and requires veterinary intervention.
The most important clinical diseases that cause hair loss in dogs are detailed below:
1. Hypothyroidism (Thyroid Insufficiency)
It is one of the most common endocrine diseases in dogs. The decrease in thyroid hormones directly disrupts the hair growth cycle.
Symptoms:
Symmetrical hair loss on the body and neck
Dull, brittle feathers
Weight gain
Chills, weakness
Darkening of the skin
Susceptibility to ear infections
Treatment is lifelong thyroid hormone supplementation.
2. Cushing Syndrome
It occurs as a result of excessive cortisol production. It creates dramatic changes on the skin and hair.
Symptoms:
Thin skin, easy to tear
Hair loss in the belly area
Excessive drinking and urination
Fatigue
Abdominal swelling
Treatment is done with medication or surgery.
3. Allergic Dermatology
Food allergy, environmental allergies (atopy) or flea allergy are the most common causes.
Symptoms:
Intense itching
foot licking
ear infection
Hair breakage and localized loss
Redness and crusting
Treatment: Elimination diet, anti-allergic drugs, anti-parasite programs.
4. Scabies (Sarcoptes and Demodex)
Sarcoptes scabies
It is the most severely itchy skin disease. It is contagious.
Symptoms:
Bloody injuries
Shedding around the ear
Intense itching
Thickening of the skin
Demodex Mange
Genetic predisposition is evident. Itching may be mild or absent.
Symptoms:
Patchy shedding
Openings around the eyes and mouth
Secondary infection
5. Fungal Infections (Dermatophytosis)
It is the most contagious cause of hair loss in dogs.
Symptoms:
Circular opening
Flaky skin
mild itching
The “dirty feather” image
Treatment: Antifungal drugs + environmental disinfection.
6. Bacterial Skin Infections (Pyoderma)
bad smell
Pustules and crusts
feather loss
Itching
It usually develops after allergies or scabies.
7. Hormone-Dependent Hair Loss (Alopecia X)
It is seen in breeds such as Pomeranian, Husky, Spitz, and Chow Chow. The cause is unknown, but it is thought to be hormonal.
Symptoms:
Extensive shedding on the hind legs
Darkening of the skin
Lack of hair growth
Diagnosis and Treatment Costs for Hair Loss in Dogs (Current Prices in EU € and US $)
Hair loss in dogs can often be caused by simple seasonal changes, but serious conditions such as hypothyroidism, Cushing's syndrome, allergies, mange, fungal infections, and bacterial dermatitis can also manifest as hair loss. Therefore, the diagnostic process is crucial and often requires the combined evaluation of several different tests.
The costs below are based on current veterinary dermatology – endocrinology clinic averages. Prices may vary depending on the country, clinic and severity of the disease.
1. Diagnostic Costs (EU – US)
Blood Tests
EU: €40 – €120
US: $60 – $180
A CBC + biochemistry test is usually the first step. It indicates whether the hair loss is caused by a systemic disease.
Thyroid Tests (T4, fT4, TSH)
EU: €60 – €180
US: $80 – $250
It is definitely done in case of suspicion of hypothyroidism.
Cushing Tests (ACTH Stim / Low Dose Dex Test)
EU: €120 – €280
US: $150 – $400
Cushing's syndrome is one of the most important causes of hair loss.
Allergy Tests (Blood or Skin Test)
EU: €150 – €350
US: $200 – $600
It is used in the diagnosis of food and environmental allergies.
Skin Scraping (for Sarcoptes and Demodex)
EU: €30 – €80
US: $40 – $120
It is mandatory in the diagnosis of scabies.
Fungal Culture / Wood Lamp / PCR
EU: €40 – €120
US: $60 – $180
It is used in cases of suspected fungal infection.
Bacterial Culture – Antibiogram
EU: €50 – €150
US: $70 – $200
It is performed when pyoderma is suspected.
Grand Total of the Diagnostic Phase:
EU: €150 – €900
US: $200 – $1,600
2. Treatment Costs (EU – US)
Hormonal Disease Treatments
Hypothyroidism:
EU: €20 – €45 / month
US: $25 – $60 / month
Medicines are used for life.
Cushing Syndrome:
EU: €60 – €140 / month
US: $70 – $180 / month
Vetoryl (trilostane) prices are in this range.
Allergy Treatment
Allergy management is often a long process.
Allergy medications:
EU: €20 – €60 / month
US: $25 – $80 / month
Oclacitinib (Apoquel):
EU: €50 – €120 / month
US: $60 – $140 / month
Immunotherapy Serums:
EU: €150 – €350
US: $200 – $500
Parasite Treatments (Scabies – Fleas – Ticks)
EU: €30 – €120
US: $40 – $150
Special drugs for Demodex and Sarcoptes (Bravecto, NexGard, Advocate, etc.).
Fungal Infection Treatment
EU: €40 – €150
US: $50 – $200
Oral antifungal medications + topical solutions.
Bacterial Dermatitis Treatment
EU: €30 – €100
US: $40 – $150
Antibiotic + antiseptic bath protocol.
General Treatment Cost Range
EU: €150 – €600+ US: $200 – $800+
In Cushing's or chronic allergies, these numbers may increase annually.
Dog Breeds Prone to Shedding (Table)
The table below includes breeds that are genetically more prone to shedding. The table format follows the standards: Breed | Description | Level of Predisposition
Race | Explanation | Level of Predisposition |
Alaskan Husky | Double-layered coat structure, seasonal heavy shedding | A lot |
Seasonal shedding is high due to undercoat thickness. | A lot | |
German Shepherd | Genetically undergoes intense feather changes | A lot |
Medium-long hair structure, prone to allergies | Middle | |
Labrador Retriever | Short but dense and constantly shedding feather structure | Middle |
Alopecia X predisposition, hormonal shedding may occur | Middle | |
Thick hair structure and susceptibility to hormonal diseases | Middle | |
Beagle | Short coat, but regular shedding throughout the year | Little |
Double-layered short coat, allergic tendency | Little | |
Energetic structure may experience stress-related shedding. | Little |
Symptoms of Hair Loss in Dogs and Early Diagnosis Tips at Home
Hair loss in dogs often appears to be a "normal change" at first glance; however, certain signs can reveal that the shedding is caused by a medical condition . Owners who recognize these signs early can prevent serious problems through both prompt diagnosis and appropriate treatment.
The following symptoms are the strongest signals that indicate that hair loss has moved beyond the normal seasonal process and has become an abnormal and clinical condition.
1. Alopecic Patches
While the hair thins evenly in seasonal shedding, in disease-related shedding, gaps occur in round , square , asymmetrical or localized areas .
Neck
Back
Above the tail
Elbows
Abdominal region
Behind the ear
Openings in the form of "gaps" in these areas are an indication of disease.
2. Itching, Excessive Licking and Biting
The dog constantly:
licking his paw
if he bites his tail
scratching his cheeks
if he is restless while lying down
if he scratches his skin
These behaviors raise suspicions of scabies, allergies, fungus or parasites .
There is no itching in seasonal shedding; this is the most important distinction.
3. Skin Redness, Flaking, or Bad Odor
Skin problems are the clearest sign that the hair loss is of "dermatological origin".
redness
crusting
dandruff
bad smell
brown spots
oily skin
pustules
bleeding
darkening (hyperpigmentation)
It is especially common in hair loss caused by Cushing's, hypothyroidism, allergies and infections.
4. Symmetrical Hair Loss (Hormonal Sign)
It is characteristic of hormonal diseases.
Areas where symmetrical hair loss occurs:
both sides of the neck
your wife
sides
body
tail circumference
This shedding is non-itchy and often goes unnoticed by owners.
5. Hair becomes dull and breaks easily
Feathers in cases of nutritional deficiencies, thyroid diseases and stress:
becomes weaker
breaks quickly
loses its shine
This is one of the early warning signals.
6. Excessive Hair Accumulation and Sudden Increase in Shedding
There is a visible increase in hair residue on the couch, carpet, clothes and dog bed.
Even in seasonal shedding, hair growth is controlled; sudden and excessive shedding is of clinical importance.
7. Specific Early Symptoms of Scabies and Ringworm
thinning of hair around the ear
ring-shaped opening around the eye
bare elbows
redness with itching
These symptoms require prompt veterinary attention.
Tips for Early Diagnosis at Home
Owners can facilitate early diagnosis with simple daily checks:
Examine the skin weekly (is there any redness, peeling, flaking?)
Check the upper tail and belly area
Compare the amount of shedding when brushing
Observe the dog's water consumption and appetite (varies with hormonal diseases)
Monitor behaviors such as foot licking and face rubbing
Be aware of increased shedding after a new food change.
In cases detected early, treatment time is shorter and costs are lower.
Diagnostic Methods for Hair Loss in Dogs (Deep Scraping, Blood Tests, Thyroid Panel, Allergy Tests)
Hair loss can be caused by a simple grooming error or a serious hormonal or dermatological condition. Therefore, diagnosis is not based on a single test, but rather on a combination of methods .
The following diagnostic methods are standard in all veterinary dermatology protocols.
1. Physical Examination and Dermatological Evaluation
The first step is to shed:
distribution
symmetry
itching condition
skin appearance
presence of lesions
odor status
is the evaluation of parameters such as feather quality.
This assessment determines which tests are necessary.
2. Skin Scraping (For Sarcoptes and Demodex)
Superficial Scraping (For Sarcoptes)
Sarcoptes scabies lives on the surface. Microscopic examination is performed from the scraping area.
Deep Scraping (For Demodex)
Since Demodex lives under the skin, scraping is required "to the point of bleeding." It is used extensively in young dogs.
This test is the gold standard for diagnosing scabies.
3. Fungal Tests (Dermatophytosis)
Wood lamp
Fungal culture
PCR tests
It is a must for round spills.
4. Blood Tests (CBC + Biochemistry)
It is the first screening test for hormonal and systemic diseases.
What they show:
infection
anemia
liver/kidney problems
hypercortisol (Cushing's) suspicion
metabolic disorders
5. Thyroid Panel (T4, fT4, TSH)
Hypothyroidism is the most common hormone-related cause of hair loss.
This panel clearly reveals thyroid function.
6. Cushing Syndrome Tests
ACTH stimulation test
Low-dose dexamethasone suppression test
This test is mandatory if there is hair loss + abdominal swelling + thin skin.
7. Allergy Tests (Blood or Skin)
Used in allergic rashes:
Food allergy
Pollen/mite allergy
Chemical sensitivity
Elimination diet is for diagnostic purposes in food allergy.
8. Bacterial Culture and Antibiogram
It is performed in cases of suspected pyoderma. It is necessary to select the appropriate antibiotic.
9. Trichogram (Hair Root Microscopy)
Feather roots:
fracture type
growth phase
The causes of weakness are examined. It indicates nutritional deficiencies and some types of fungi.
10. Ultrasound and Additional Tests (If Necessary)
In cases of suspected Cushing's disease, adrenal gland dimensions are evaluated by ultrasound.
Hair Loss Treatments in Dogs: Medical, Dermatological, and Hormonal Approaches
Treatment for hair loss in dogs begins with accurately identifying the underlying cause. Hair loss is not a single disease; it's a common symptom of dozens of different problems. Therefore, treatment should focus on the cause, not the symptom .
Below is a comprehensive treatment guide prepared according to all veterinary dermatology–endocrinology protocols.
1. Nutrition-Based Therapy
Nutritional deficiencies are one of the most common causes of hair loss. Therefore, the first step is often diet optimization .
Protein Supplement
Without quality protein, feather growth slows down. Recommended protein sources:
turkey
chicken
salmon
egg
lamb
commercial turkey or fish-based foods
Omega-3 (EPA/DHA) Supplement
The strongest scientific evidence for hair and skin health is in Omega-3 oils. Benefits:
reduces redness
controls itching
improves feather quality
strengthens the skin barrier
Zinc – B Complex – Amino Acid Supplement
Zinc deficiency is very common, especially in hair loss around the eyes. B complex vitamins support the hair growth cycle.
2. Treatments for Hormonal Diseases
Hormonal shedding is a non-itchy , symmetrical and slowly progressing type of shedding. Treatment should definitely be done under professional veterinary supervision.
Hypothyroidism Treatment
Thyroid hormone (levothyroxine) is used for life.
Regular blood monitoring is required.
A significant improvement in feather quality begins within 4–6 weeks.
Cushing Syndrome Treatment
Hormone control is achieved with Trilostane (Vetoryl).
Skin thinness, shedding and infections decrease over time.
Regular ACTH tests should be performed.
Alopecia X Treatment
Especially in breeds such as Pomeranian, Husky, Chow Chow:
melatonin
microcirculation supports
Special shampoo-spray protocols are used.
3. Allergic Dermatology Treatments
Allergies are one of the most persistent and chronic causes of hair loss.
Food Allergy Treatment
An 8–12 week elimination diet is essential.
Single protein diets (turkey, duck, salmon) are preferred.
Atopic Dermatitis Treatment
Apoquel (oclacitinib)
Cytopoint injections
Omega-3 supplements
Medical shampoos
Hypoallergenic cleaning at home
Flea Allergy Treatment
Flea-tick drops/tablets
Anti-itch medications
Regular cleaning of the home environment
4. Parasite (Scabies, Fleas, Ticks) Treatments
Sarcoptes scabies
Isoxazoline group drugs such as Bravecto, NexGard, Simparica
Redness and itching subside within 1–2 weeks.
The home environment and bedding should be cleaned.
Demodex Mange
Long-term treatment may be required
Isoxazoline drugs are effective in most cases
If there is a secondary infection, antibiotics are added
5. Fungal Infection (Dermatophytosis) Treatment
Oral antifungals (itraconazole, terbinafine)
Local sprays and shampoos
Deep cleaning and disinfection of home surfaces
Caution is required as there is a possibility of transmission to humans.
6. Bacterial Infection Treatment
In cases of pyoderma:
antibiotics
antiseptic shampoos
itch control
In most cases, 2–6 weeks of treatment is required.
7. Topical Treatments and Skin Barrier Strengthening
Colloidal oatmeal shampoos
Chlorhexidine antiseptic washes
Moisturizing sprays
Skin barrier repair lotions
These products quickly improve hair quality, especially in cases of allergies and itching.
8. Supportive Treatments
Probiotics → support skin health
Melatonin → effective in some hair loss
Adeqean → may help with hormone-induced skin thinning
Antioxidant supplements → strengthens the hair follicle
9. Advanced Treatments (Rare Cases)
light therapy (low-level laser)
immunotherapy serums
dermatological immune modulation treatments
Home Care: Nutrition, Vitamins, Omega-3, Bathing Frequency and Coat Care Routines
Home care strategies can significantly reduce hair loss, independent of medical treatment. With the right care routine, hair quality is strengthened, the skin barrier is repaired, and shedding is minimized.
1. Regular Combing and Brushing Routine
3–4 times a week for double-layered breeds
1–2 times a week for short-haired breeds
Undercoat brushes should only be used during seasonal transitions.
Brushing removes dead hair and provides oxygen to the hair follicles.
2. Correct Bathing Frequency
Improper bathing routine can increase shedding by 2–3 times .
Ideal bathing frequency:
In normal dogs: once a month
For allergic dogs: 1 medical bath per week
Long-haired breeds: every 2–3 weeks
Excessive bathing → destroys the oil layer → increases itching and flaking.
3. pH Value of the Shampoo Used
Dog skin has a much more alkaline pH structure than humans. Human shampoos are effective on dogs:
itching
redness
causes intense shedding.
Dog shampoo must be used.
4. Omega-3 Supplements
It is the most effective supplement applied at home.
Benefits:
increases the shine of the hair
reduces itching
strengthens the skin barrier
helps with allergies
increases feather density
Salmon oil is the most recommended source.
5. Choosing Quality Food
The food must contain:
quality animal protein
omega-3 fatty acids
zinc
biotin
prebiotic fibers
Low-quality fillers such as corn, wheat, and soy can increase hair loss.
6. Stress Management
In dogs with stress-related shedding:
exercise should be increased
Game and intelligence toys should be added
a regular routine should be established
Behavioral therapy should be done for separation anxiety
Once stress is reduced, hair loss usually decreases significantly within 2–6 weeks.
7. Home Environment Care
Bedding and blankets should be washed regularly
Carpets and seats should be vacuumed frequently
rooms should be well ventilated
This significantly reduces shedding, especially in allergic dogs.
8. Vitamin and Mineral Supplements
Biotin
Zinc methionine
Folic acid
B12
L-lysine
It strengthens the hair roots.
The Effect of Stress, Anxiety, and Environmental Factors on Hair Loss in Dogs
Stress is a significant factor triggering numerous physiological and behavioral symptoms in dogs, and hair loss is one of these symptoms. While many owners attribute hair loss solely to skin diseases or seasonal changes, stress-induced hair loss is an extremely common problem in clinical dermatology.
Dogs' stress response, like in humans, is triggered by increased levels of the hormone cortisol . High cortisol suppresses the immune system, weakens the skin barrier, and causes hair follicles to enter a premature shedding phase, ultimately accelerating hair loss.
1. What Does Stress-Related Hair Loss Look Like?
Clinical features of stress-related hair loss include:
There is a general (widespread) shedding, not in the form of patches.
The feathers become weak, dull and break easily.
The dog may not itch, meaning there is no obvious itching like allergies.
It is typical for hair to be seen more on the ground when sitting and standing up.
A sudden increase in shedding called “shedding burst” may occur.
This type of shedding usually subsides within a few weeks once the stress factor is resolved.
2. The Most Common Causes of Stress
The main events that cause stress in dogs:
Separation Anxiety
Hair loss is common in dogs that experience extreme stress when separated from their owner.
House Change
New surroundings, new smells and changes in routine disrupt the dog's balance.
Bringing a New Pet or Baby Home
The dog may feel like he is losing his territory.
Noise and Scary Warnings
thunder
firework
loud renovations
It suddenly raises cortisol levels.
Insufficient Exercise and Boredom
It is one of the most underestimated causes of stress. Behavior problems and hair loss may increase in dogs with accumulated energy.
Tense Environment / Chaos at Home
Dogs have a keen sense of emotional atmosphere.
3. Effects of Environmental Factors on Feather
Temperature and Humidity Changes
Excessive heat increases skin dryness → shedding increases.
Poor Quality Indoor Ventilation
Moist, closed environments trigger fungi and bacteria.
Dirty Bedding and Carpets
Allergen accumulation → itching → flaking.
Dust Mites
It is the main cause of shedding in dogs experiencing allergic dermatitis at home.
4. Ways to Reduce Stress-Related Hair Loss
Exercise
Short, high-quality walks 2–3 times a day reduce cortisol levels.
Mental Activity
intelligence toys
hide-and-seek games
chew toys
It reduces stress.
Regular Routine
Every day at the same times:
food
sleep
Exercise significantly reduces dog stress.
Creating a Comfort Zone
Own bed, a quiet corner, fixed toys → provides a sense of security.
Behavioral Therapy
It is an effective method for separation anxiety and noise phobia.
Pheromone Spray/Diffusers
Provides a natural soothing effect (like Adaptil).
Organizing the Home Environment
Ventilation, bed cleaning, allergen control directly affect skin health.
Proper Care Strategies for Seasonal Shedding
Seasonal shedding (shedding) is the most natural type of shedding in dogs. However, in some breeds, it is so intense that the amount of hair inside the house can become a challenge for owners.
This shedding is not a health problem , but if not managed properly:
feathers tangled
skin cannot breathe
dandruff increases
bad odor occurs
irritation may occur
The following care routine controls seasonal shedding most effectively.
1. Regular and Correct Brushing
Undercoat Cleaning
For breeds such as Husky and German Shepherd, combing the undercoat is very important during seasonal transitions.
brushing 3–4 times a week
shedding blades or undercoat rake combs
reduces hair loss by 50–70%
Short-Haired Breeds
Rubber-tipped fur gloves are effective for breeds such as Beagles, Pugs and Staffordshires.
2. Correct Bathing Frequency
During seasonal transitions:
Bath every 3–4 weeks
Neutral pH dog shampoo that does not dry the skin
Frequent bathing dries the skin → increases shedding.
3. Omega-3 and Moisturizing Supplements
Omega-3 supplementation during the shedding period:
grows hair
reduces shedding by half
strengthens the skin barrier
Additionally, moisturizing sprays and appropriate care oils can be used.
4. Seasonal Nutrition Support
During seasonal shedding periods:
salmon-based diet
Zinc and biotin supplements strengthen skin and feather health.
5. House Cleaning and Allergen Control
During the shedding period:
the house should be ventilated
Beds and blankets should be washed once a week.
carpets should be vacuumed regularly
This is necessary not only for hygiene but also to reduce the dog's allergic load.
6. Lint Removers and Household Management
lint rollers
HEPA filter vacuum cleaners
antistatic gloves
They are important at-home tools for managing seasonal shedding.
Hair Management in Multi-Pet Environments
If multiple dogs or both cats and dogs live in a household, managing shedding can be more challenging than in single-dog households. Not only does the amount of hair increase, but the social dynamics between the animals—stress, competition, and intensity of play—directly impact shedding.
In multi-pet environments, coat management should be addressed not only through housekeeping but also through behavioral, nutritional, and environmental adjustments .
1. Each Animal Should Have a Separate Resting Area
Competition between animals for resources (bed, toys, food bowl) creates stress. Stress → increase in cortisol → increase in hair loss.
Because:
each dog has its own bed
their own toys
must have its own food and water area.
This significantly reduces shedding, especially in sensitive and dominant dogs.
2. Regular Ventilation in Common Areas
In multiple homes:
amount of feathers
dust
mite
bran
the allergen load is high.
10–15 minutes of daily airing reduces shedding in allergic dogs.
3. The Brushing Routine Should Cover All Pets in the House
Brushing a single dog is not enough. An unbrushed animal increases the hair load of the others.
Suggestion:
separate brush for each dog
screening 2–4 times a week
more frequently seasonally
This reduces shedding and maintains household hygiene.
4. Use a HEPA Filter Air Purifier at Home
Especially if breeds that shed a lot are together, HEPA filtered devices reduce the hair and allergen load. This is comforting for both humans and animals.
5. Be Careful When Sharing a Bed
In many homes, dogs sleep in a shared bed. This is the case:
increases feather transfer
If disease is present, it increases the risk of spreading it
Suggestion:
Bedding should be washed once a week
If possible, each dog should have its own bed.
6. Multiple Animal Play Can Increase Shedding
Intense play → friction → feather tearing. This is normal. However, aggressive play can also cause skin irritation.
Play time should be kept balanced.
7. Stress Management Is Much More Critical
Stress factors multiply in multi-animal homes. Signs of stress:
constant licking
tail between the legs
one dog follows another like a shadow
not wanting to go to bed
These situations accelerate shedding.
To balance:
a fixed daily routine
increasing exercise
field management
behavioral reinforcement training
becomes very important.
8. Nutritional Quality Should Be Equal for All Animals
If one dog eats good food while the other eats poor quality food:
someone's feathers become shiny
the other one will shed more
This directly affects the hair density in the house.
9. Pets Grooming Each Other
Some dogs may lick another dog's face, ears, or back. While this is natural social behavior,:
excessive licking → local shedding
irritation → itching → flaking
may lead to such results.
It needs to be observed.
10. Allergy Risk is Higher in Multi-Pet Homes
As the amount of hair, dandruff and skin particles increases in a home, the risk of allergic dermatitis increases. Therefore, in common areas:
frequent cleaning
bed shaking
Vacuuming carpets makes a huge difference.
Common Mistakes and Myths About Excessive Hair Shedding in Dogs
It's common for owners to make well-intentioned, but misinformed, mistakes when trying to help a shedding dog. These mistakes can worsen the shedding rather than stop it. Below, we provide scientific explanations of the most common mistakes and common myths.
1. “If I bathe frequently, hair loss will decrease.” – False
Frequent bathing removes the oil layer of the skin, causing dryness and itching. This increases shedding.
Correct: Bath once a month, medical shampoo if necessary.
2. “It’s okay to use human shampoo.” – False
The pH structure of dog skin is different from that of humans. Human shampoo:
itching
dryness
shedding
does.
3. “If I change the food, it will be better immediately.” – False
It takes 4–8 weeks for hair loss due to nutrition to resolve. It is unrealistic to expect rapid improvement.
4. “Shaving stops hair loss.” – False
Shaving does not stop shedding; it only makes the shedding less noticeable. Furthermore, in some breeds, it damages the structure of the coat.
5. “Shedding is seasonal, no need to worry.” – False
The first symptom of some diseases (hypothyroidism, Cushing's, scabies) is hair loss. Waiting for a long time may cause the disease to progress.
6. “There are no fleas, so there is no itching.” – False
In dogs with flea allergies , even a single flea bite can cause shedding.
7. “Omega-3 doesn’t work.” – False
Omega-3 supplements have the strongest scientific support for hair health. However, their effects are seen after 3–6 weeks.
8. “Stress doesn’t cause hair loss.” – False
Stress directly triggers hair loss through an increase in cortisol.
9. “It’s just shedding, if the skin is intact there’s no problem.” – False
In hormonal diseases, the skin appears intact but shedding may be severe.
10. “Hair loss is a natural part of aging.” – Partly false
Old age may increase hair loss but it can always be linked to a clinical cause .
Frequently Asked Questions (FAQ)
In what cases is hair loss in dogs considered normal?
Normal shedding is associated with seasonal changes, particularly in spring and fall. During this period, dogs renew their undercoat, and the hair sheds evenly. If there is no redness, itching, foul odor, crusting, or patchy skin breakage, this shedding is considered physiological. Seasonal shedding is normal if energy, appetite, and general health are normal.
How can I tell if my dog's hair loss is seasonal or due to illness?
While seasonal hair loss is characterized by thinning and even hair loss, disease-related hair loss is characterized by itching, localized patches, redness, dandruff, darkening of the skin, foul odor, sores, and constant licking. Furthermore, hormonal hair loss is symmetrical, and the skin is generally non-itchy. These differences make it easier to distinguish disease-related hair loss.
What are the diseases that most commonly cause hair loss in dogs?
The most common diseases are: hypothyroidism (underactive thyroid), Cushing's syndrome, food and environmental allergies, flea allergy dermatitis, Sarcoptes and Demodex mange, fungal infections (dermatophytosis), bacterial pyoderma, Alopecia X, and zinc deficiency. Many of these diseases progress and cause chronic hair loss if left untreated.
What tests need to be done for hair loss in dogs?
A comprehensive diagnosis includes a physical exam, skin scrapings, blood tests, a thyroid panel (T4, fT4, TSH), Cushing's test (ACTH/LDDS), fungal tests (culture/PCR), allergy tests, bacterial cultures, and, if necessary, an ultrasound. The diagnostic process often involves multiple tests, as there may not be a single cause for the rash.
How does hypothyroidism cause hair loss?
Hypothyroidism slows the hair growth cycle due to decreased thyroid hormone levels. Hair becomes dull, breaks easily, doesn't grow, and typically symmetrical shedding occurs on the body. The skin cools, thickens, and may darken. Once hormone levels improve with treatment, the coat structure recovers within a few weeks.
How does Cushing's syndrome trigger hair loss in dogs?
In Cushing's syndrome, the hormone cortisol is overproduced. This hormone causes thinning of the skin, hair loss in the abdominal area, itching, recurring infections, and noticeable hair loss. Symmetrical hair loss is particularly evident on the abdomen, flanks, and back.
What causes hair loss in allergic dogs?
Allergies cause intense itching. As a dog scratches, hair follicles are damaged, irritation occurs, and localized shedding occurs. The most common causes are food allergies, dust mite allergies, pollen allergies, and flea allergies. Shedding will not resolve unless the allergy is controlled.
Could scabies be the first sign of hair loss?
Yes. Sarcoptes mange causes rapid shedding accompanied by intense itching. Characteristic shedding is seen around the ears, elbows, and abdomen. Demodex mange, on the other hand, causes patchy shedding in young dogs. If left untreated, the mange spreads rapidly.
What does a fungal infection look like on my dog's fur?
Fungal infections are often identified by ring-shaped patches of flaking. The skin is scaly, accompanied by mild itching, redness, and sometimes a foul odor. This infection can be transmitted to humans, so it's important to treat it early.
Can flea allergy cause hair loss?
Yes. Flea allergy dermatitis (FAD) is one of the most common causes of shedding in dogs. Even a single flea bite can cause intense itching and extensive shedding on the upper part of the tail. Without regular deworming, shedding can become chronic.
Does changing food reduce hair loss?
Nutrition plays a critical role in shedding. Diets rich in high-quality protein, Omega-3, zinc, and B vitamins promote coat health. However, changing food doesn't have immediate effects; results are usually seen after 4–8 weeks.
Do omega-3 supplements really reduce hair loss?
Yes. Omega-3 fatty acids (especially EPA/DHA) are a supplement scientifically proven to strengthen the skin barrier, reduce itching, and increase coat shine. With regular use, significant improvement is seen within 3–6 weeks.
Will bathing my dog frequently reduce shedding?
No. Frequent bathing removes the skin's protective oil layer, increasing dryness and shedding. The ideal bathing frequency for a healthy dog is once a month. For dogs with allergies, weekly baths with special medicated shampoos may be recommended.
Does human shampoo cause hair loss in dogs?
Yes. Human shampoos are not suitable for the different pH levels of dog skin and damage the skin barrier. They can cause itching, irritation, and intense shedding. Specially formulated shampoos for dogs should be used.
How long does seasonal shedding last?
It usually lasts between 2 and 6 weeks. It can be denser and longer in breeds with double-layered fur (Husky, German Shepherd). Regular brushing and proper nutrition can shorten the period.
What can I do to manage hair loss at home?
Regular brushing, quality food, Omega-3 supplementation, proper bathing routine, frequent washing of bedding and blankets, ventilation of the house and stress-reducing environmental arrangements significantly reduce shedding.
Does stress cause hair loss in dogs?
Yes. Stress increases cortisol levels, weakening hair follicles. Situations like separation anxiety, moving house, loud noises, the arrival of a new pet, and inadequate exercise can all cause stress-related shedding.
Does shaving dogs reduce shedding?
No. Shaving doesn't stop shedding; it just makes the hair less visible. Additionally, shaving can damage the coat structure in some long-haired breeds.
Is it normal for puppies to shed hair?
Yes. When puppies are 4–6 months old, they shed their puppy coat and transition to their adult coat. This is a physiological process and not a sign of illness.
Why does my dog's coat look dull and lifeless?
Dullness is often associated with nutritional deficiencies, omega-3 deficiency, inadequate brushing, bathing errors, or thyroid problems. Fungal, mange, and bacterial infections also degrade coat quality.
My dog is losing hair on his tail, what could be the reason?
Shedding on the tail is often associated with flea allergies , anal gland problems , seborrhea , Demodex , or hormonal disorders . Flea allergies, in particular, target this area.
Does hair loss transmit diseases to humans?
Most types of shedding are not contagious. However, fungal infections (dermatophytosis) can be transmitted to humans. Therefore, prompt diagnosis and treatment are crucial for dogs with ring-shaped shedding.
Is shedding more intense in multi-pet environments?
Yes. Households with multiple animals can increase hair growth and stress levels. Stress increases shedding. Shared bedding can also facilitate the spread of diseases.
Does hair loss go away on its own?
Seasonal shedding will subside, but shedding caused by allergies, hormonal conditions, fungi, scabies, or nutritional deficiencies will not resolve without treatment. Treatment directed at the cause is essential.
When is my dog's shedding considered dangerous?
In the following cases, a veterinary examination is required without delay:
patch-shaped openings
severe itching
bad smell
redness and sores
shedding of skin along with hair
sudden and intense shedding
if it is accompanied by weakness or loss of appetite
These symptoms may indicate a serious underlying disease.
Sources
American Veterinary Medical Association (AVMA)
European Society of Veterinary Dermatology (ESVD)
Veterinary Endocrinology Consensus Reports
World Small Animal Veterinary Association (WSAVA) Dermatology Guidelines
Mersin Vetlife Veterinary Clinic – Open on Map: https://share.google/XPP6L1V6c1EnGP3Oc
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