Is Your Pet Drinking More Water? Diabetes Signs in Cats and Dogs
Is Your Pet’s Water Bowl Emptying Faster Than Usual?
You fill the water bowl in the morning, but it needs topping up again sooner than expected. Your dog keeps returning for another drink, or your cat suddenly spends more time at the water fountain. These changes can be easy to overlook when your pet otherwise seems comfortable.
A persistent increase in drinking is worth discussing with your veterinarian. Increased thirst is one of the signs of diabetes in cats and dogs, particularly when it occurs alongside larger amounts of urine, increased hunger or unexplained weight loss. However, thirst alone cannot identify the cause.
A bowl emptying faster does not always mean your pet is drinking excessively. Spilled water, another animal sharing the bowl, warmer weather, increased activity or a change from wet to dry food can affect what you notice. The useful question is whether your pet’s drinking has changed from its usual pattern.
Look at the wider picture. Are you cleaning larger litter clumps? Is your dog asking to go outside more frequently or having accidents indoors? Does your pet seem hungry but look thinner? Several changes occurring together provide more useful information than the water bowl alone.
If the increase persists or accompanies other symptoms, arrange a veterinary appointment. Write down when you first noticed it and any recent changes in food, medication or routine. You do not need a perfect record before seeking advice.
Keep fresh water freely available. Restricting access will not treat the cause of increased thirst and can leave a pet that is losing extra fluid at greater risk of dehydration.
Why Can Diabetes Make Cats and Dogs Drink More Water?
Diabetes mellitus affects the body’s ability to use glucose, a form of sugar that supplies energy to cells. Insulin helps regulate this process. When there is insufficient insulin, or the body does not respond to it adequately, glucose can build up in the bloodstream.
The kidneys normally filter blood and reclaim glucose rather than allowing substantial amounts to leave in urine. When blood glucose rises beyond the kidneys’ capacity to reclaim it, glucose spills into the urine and draws additional water with it. This process increases fluid loss.
The pet then drinks more to replace the water being lost. Although owners may notice the extra drinking first, increased urine production is an important part of the underlying problem. A dog may need more frequent toilet breaks, while a cat’s litter tray may become noticeably wetter.
This also explains why limiting water is unsafe. The extra drinking is a response to fluid loss; taking the bowl away does not stop glucose from entering the urine or correct the diabetes.
At the same time, the body may struggle to use glucose effectively for energy. It can begin breaking down fat and muscle, helping explain why some diabetic pets lose weight despite maintaining—or increasing—their appetite.
Increased thirst, increased urination and weight loss together warrant prompt veterinary assessment. These signs are not exclusive to diabetes, so diagnosis requires an examination and appropriate testing rather than an assumption based on drinking behaviour.
More Urine, Bigger Litter Clumps and Unexpected Accidents
Sometimes the first noticeable change happens in the litter tray or during your dog’s toilet routine. You may find larger clumps, need to replace litter more often or notice that a previously house-trained dog cannot comfortably wait until its usual walk.
Diabetes can increase the volume of urine a pet produces. For cats, this may mean larger or more numerous urine clumps. Dogs may pass larger amounts outside, ask for additional toilet breaks or wake their owners during the night.
These changes should not automatically be treated as a training problem. Punishing accidents does not address a medical cause and may make the situation more stressful. Give your pet appropriate opportunities to urinate while arranging veterinary advice.
It is useful to distinguish passing larger amounts of urine from repeatedly attempting to pass only a few drops. Frequent small amounts, straining, discomfort or blood in the urine can indicate a different urinary problem. Repeated attempts to urinate with little or no output—particularly in a male cat—require urgent veterinary attention.
In a household with several cats, litter clumps alone may not reveal which animal is affected. Note what you can observe without restricting water or delaying an appointment while trying to collect perfect evidence. Changes in litter type and cleaning frequency can also affect how clumps appear.
Tell your veterinarian whether you are seeing larger volumes, more frequent attempts, accidents or signs of discomfort. The pattern matters, and it helps guide the examination and choice of tests.
Eating Well but Losing Weight: Another Change to Watch For
A pet that finishes every meal may appear healthy, even when its body is changing. An owner might notice that a collar fits more loosely, the waist looks narrower or the spine and hips feel more prominent during grooming.
Weight loss despite a normal or increased appetite is an important sign of diabetes in cats and dogs. When the body cannot use glucose effectively, it may break down stored fat and muscle to meet its energy needs. Eating more does not necessarily prevent that loss.
This combination can be misleading in a pet that was previously overweight. Unplanned weight loss should not be assumed to be a healthy improvement, especially when it accompanies increased thirst or urination. Healthy weight management should be intentional and monitored.
If possible, compare recent weights from veterinary visits rather than relying entirely on appearance. Long coats can conceal changes, while gradual muscle loss may become apparent only when you feel along the back or hindquarters. Record any changes in meal size, treats or access to another pet’s food as well.
Diabetes is not the only explanation. Other illnesses can also cause weight loss despite a good appetite, so increasing food indefinitely without investigating the cause can delay appropriate care.
A reduced appetite does not rule out diabetes either. A pet that becomes unwilling to eat, vomits or develops marked weakness needs prompt assessment, particularly if increased drinking and weight loss were already present. Do not wait for every “classic” sign to appear before contacting your veterinarian.
Diabetes Signs in Cats and Dogs: Similarities and Differences
Cats and dogs share several important signs of diabetes: increased thirst, increased urination and weight loss despite a normal or increased appetite. The changes owners notice first often depend on their pet’s routine.
A dog may start waking you for extra toilet breaks, while a cat may leave unusually large urine clumps in the litter tray. Neither pattern is specific to diabetes, but both deserve attention when they represent a persistent change.
Some complications also differ between species:
Change | What Owners May Notice |
Increased thirst and urination | More frequent drinking, larger urine clumps, longer urination or unexpected accidents in either species. |
Weight loss despite eating well | A thinner body, more prominent bones or loss of muscle in either cats or dogs. |
Cataracts, particularly in dogs | Cloudiness within the eyes or changes in vision, such as bumping into familiar objects. |
Nerve damage in some diabetic cats | Hind-leg weakness or walking with the hocks lowered toward the ground. |
Deteriorating general health | Reduced activity, weakness, poor appetite or vomiting, which require prompt assessment. |
Cloudy eyes do not automatically mean diabetes, and an unusual walking posture can have other causes. These findings need examination rather than diagnosis from appearance alone.
Owners should also avoid waiting for these more noticeable complications. A pet can have diabetes without cloudy eyes, hind-leg weakness or every symptom listed above. Increased drinking and urination, particularly alongside unexplained weight loss, are sufficient reasons to arrange a veterinary appointment.
The purpose of recognising these differences is to describe changes accurately—not to decide at home which disease your pet has.
Can Increased Thirst Have Causes Other Than Diabetes?
Yes. Increased thirst is a symptom, not a diagnosis. Diabetes is one possible explanation, but several everyday factors and medical conditions can change how much a cat or dog drinks.
Warmer weather and increased exercise can raise water needs. A switch from moisture-rich food to dry food may also make drinking more noticeable because less water is being supplied through meals. These factors are useful context, but they should not automatically explain away a persistent or substantial change.
Medical causes can include kidney disease, hormonal disorders and other illnesses that affect fluid balance. Hyperthyroidism is an important consideration in older cats, while Cushing’s disease can cause increased thirst and urination in dogs. Certain medications, including corticosteroids and diuretics, can also change drinking patterns.
Tell your veterinarian about all prescribed medicines and supplements. Do not stop a medication on your own because you suspect it is causing thirst; the veterinarian can assess whether the change is expected or needs investigation.
Look beyond drinking alone. Weight changes, appetite, urine output, vomiting and activity levels all help build the clinical picture. Your veterinarian may recommend blood and urine tests to distinguish between possible causes.
If your pet drinks more but otherwise seems well, a persistent change still deserves an appointment. If increased thirst occurs with vomiting, loss of appetite, significant weakness or obvious illness, seek advice promptly rather than monitoring for several more days.
Throughout this process, keep fresh water available. Restricting it can worsen dehydration without treating the underlying problem.
How to Track Your Pet’s Drinking Without Restricting Water
You do not need specialist equipment to notice a change in drinking. A measuring jug and a simple daily record can provide useful information, provided your pet continues to have unrestricted access to fresh water.
At the start of a 24-hour period, measure how much water you put into each bowl. Record any refills, then measure what remains at the end. Subtracting the remaining water from the total supplied gives an estimate of how much disappeared during that period.
That estimate is not always the same as the amount swallowed. Spills, evaporation and other animals using the bowl can affect the result. Water fountains may also be harder to measure accurately. Tell your veterinarian about these limitations rather than presenting the figure as exact.
Keep the usual routine wherever possible. Do not remove familiar drinking stations or change from wet to dry food just to simplify measurement. Food supplies water too, so record the type of food and any recent dietary changes.
A useful record can include:
Approximate water consumed over 24 hours.
Changes in urination or litter clump size.
Appetite, activity and any vomiting.
Recent weight measurements, if available.
Current medicines and changes in diet or weather.
In a multi-pet household, an individual measurement may be difficult. Observations such as repeated visits to the fountain or unusually long drinks are still worth reporting. Ask your veterinarian how to collect more reliable information without causing unnecessary stress.
Do not delay an appointment to complete several days of monitoring. Measurements can support an assessment, but persistent increased thirst or accompanying illness already provides a reason to seek advice.
Which Cats and Dogs Are More at Risk of Diabetes?
Diabetes can develop in pets with different backgrounds, but some factors increase the likelihood. Recognising risk can encourage earlier investigation; it cannot confirm or exclude the disease.
In cats, important risk factors include excess body weight, increasing age and physical inactivity. Male cats are also at higher risk. Obesity can reduce the body’s sensitivity to insulin, making healthy weight management particularly important for feline diabetes prevention.
Some cats receiving glucocorticoid medication may also be more susceptible. However, a prescribed steroid may be necessary to control another illness. Do not stop or reduce treatment yourself; discuss monitoring and any changes in thirst or urination with the prescribing veterinarian.
In dogs, diabetes is more commonly recognised in middle-aged and older animals. Female dogs and certain breeds, including Samoyeds, Miniature Schnauzers and Poodles, have increased susceptibility. A history of pancreatitis is another relevant factor because the pancreas contains the cells responsible for producing insulin.
Risk patterns are not identical in cats and dogs. In particular, the strong relationship between obesity and feline diabetes should not be used to explain every case of canine diabetes. Hormonal conditions, pancreatic disease and medication history may all influence an individual dog’s assessment.
A young, lean or active pet can still become ill, while an older or overweight pet will not inevitably develop diabetes. Symptoms deserve attention regardless of whether your animal fits a typical risk profile.
Maintain an appropriate body condition, encourage suitable activity and keep routine veterinary appointments. If weight loss is needed, use a planned, gradual approach—especially for cats—rather than sharply restricting food. These measures support health, but they cannot guarantee that diabetes will never develop.
When Should You Book a Veterinary Appointment?
Contact your veterinarian when you notice a persistent, unexplained increase in drinking or urination—even if your pet still seems happy and eats normally. Diabetes can develop before an animal looks obviously unwell, and waiting for severe symptoms may allow complications to develop.
Mention any associated changes when booking. Increased thirst combined with weight loss, increased hunger or new toilet accidents deserves prompt assessment. Your clinic can help determine how soon your pet should be examined based on the symptoms and overall condition.
Do not dismiss these changes as an inevitable part of ageing. Older pets may develop illnesses that affect drinking, urination and body weight, but these symptoms still need investigation. Similarly, a previously overweight animal losing weight unexpectedly should not automatically be considered healthier.
Before the appointment, gather whatever information is readily available: when the changes began, recent weights, food and medication details, and observations about drinking and urination. A photograph or short video can help explain an unusual walking posture or behaviour.
You do not need to prove that your pet is drinking “too much” before asking for help. Your knowledge of its usual routine is valuable. Avoid delaying the visit while trying to obtain an exact water measurement.
Ask the clinic whether it wants a urine sample and how it should be collected and stored. Do not fast your pet or change prescribed medication unless instructed. Keep water available and maintain the normal routine while awaiting advice.
Vomiting, Weakness or Loss of Appetite: When It Becomes Urgent
A pet that has been drinking more and losing weight needs more urgent attention if it starts vomiting, refuses food or becomes noticeably weak. These changes can indicate a serious complication or another illness that requires prompt treatment.
One possible complication is diabetic ketoacidosis, often shortened to DKA. When the body cannot use glucose adequately, it may break down fat rapidly and produce excessive ketones. This can lead to dangerous changes in blood acidity, dehydration and electrolyte balance.
DKA can occur before an owner knows the pet has diabetes. A previous diagnosis is therefore not required for the situation to be urgent.
Seek veterinary assessment urgently if increased thirst or suspected diabetes occurs with:
Repeated vomiting or an inability to keep water down.
Loss of appetite, especially with lethargy or weakness.
Marked dehydration or rapid deterioration.
Unusual deep or rapid breathing at rest.
Difficulty standing, collapse or reduced responsiveness.
Collapse, severe weakness or breathing difficulty requires immediate emergency care. Tell the clinic about the earlier drinking, urination and weight changes, even if those symptoms seemed minor at the time.
These signs do not prove DKA. Other serious conditions can produce a similar picture, and blood and urine tests are needed to identify the cause. Do not wait for a sweet or unusual breath smell; its absence does not rule out an emergency.
Do not attempt to correct suspected diabetes with borrowed insulin, human medication or dietary changes alone. Insulin given incorrectly can cause dangerously low blood sugar. An unwell pet needs assessment and an individual treatment plan, which may include hospital care.
How Do Veterinarians Diagnose Diabetes in Cats and Dogs?
Diabetes is diagnosed by combining the pet’s symptoms with blood and urine test results. Increased thirst alone is not enough, and a single abnormal blood glucose measurement does not always tell the whole story.
Your veterinarian will ask about drinking, urination, appetite, weight changes and medication use. The examination may include checking body condition, muscle mass, hydration and signs of other illnesses.
Blood testing measures glucose and helps assess the pet’s broader health. Urinalysis checks for glucose in the urine and other abnormalities, including ketones when relevant. Persistent high blood glucose together with glucose in the urine and compatible symptoms supports a diagnosis of diabetes.
Stress can temporarily raise blood glucose, particularly in cats. An elevated reading during a stressful clinic visit may therefore need further investigation before a diagnosis is made. Your veterinarian may recommend repeat measurements, home monitoring or a fructosamine test, which provides information about average glucose levels over approximately the preceding two weeks.
Additional tests may be needed to investigate other causes of increased thirst or conditions occurring alongside diabetes. Depending on the findings, these might include a urine culture or assessments for kidney disease, thyroid disease or pancreatitis.
An unwell pet may also need urgent checks of ketones, electrolytes and acid–base balance to assess for diabetic ketoacidosis.
Home glucose meters and urine strips can be useful when incorporated into a veterinary plan, but an isolated home result should not be used to diagnose diabetes or decide an insulin dose. The results need to be interpreted alongside the animal’s condition and other findings.
What Happens If Your Pet Is Diagnosed With Diabetes?
A diabetes diagnosis means your pet needs an ongoing care plan, but it does not automatically mean a poor quality of life. Many diabetic cats and dogs can remain comfortable and active with appropriate treatment and monitoring.
The first priority is determining whether your pet is stable. An animal with diabetic ketoacidosis, significant dehydration or other serious complications may need hospital treatment before a home routine can begin.
For dogs, insulin is the mainstay of treatment. Cats may also receive insulin, while certain oral medications are an option for carefully selected cats where available. These medicines are not suitable for every cat and require specific safety checks and monitoring. Your veterinarian will explain which approach fits your pet.
Food, meal timing, activity and weight management form part of the plan. There is no single diet that suits every diabetic animal. Cats and dogs may have different nutritional needs, and other medical conditions can influence the choice.
Before you leave the clinic, make sure you understand how to give the prescribed treatment, what to monitor and whom to contact if something changes. Ask specifically what to do if your pet refuses a meal, vomits or misses a dose. Do not improvise dose changes or give extra medication to compensate.
Follow-up appointments help assess symptoms, body weight and glucose control. Some diabetic cats can achieve remission, meaning they no longer need insulin for a period, but this is not guaranteed and ongoing monitoring remains necessary. Dogs generally require lifelong insulin treatment.
The goal is a manageable routine that keeps your pet well while reducing the risks of both high and dangerously low blood sugar.
Small Changes Worth Noticing: What Pet Owners Can Do Today
Recognising a possible health problem does not require watching your pet constantly. It starts with knowing what is normal: how often you refill the bowl, what the litter tray usually looks like and whether your pet’s weight and appetite are stable.
Pay attention to changes that persist or occur together. More drinking may be easier to interpret when you also notice larger amounts of urine, unexpected accidents or weight loss despite a good appetite. Write these observations down so you can describe them clearly at an appointment.
Make simple checks part of your existing routine. Notice body condition during grooming, keep track of weights recorded at veterinary visits and mention changes in appetite rather than assuming an enthusiastic eater must be healthy. In households with several animals, check whether one pet’s behaviour has changed even when individual food or water intake is difficult to measure.
Avoid making drastic changes while trying to work out the cause. Keep fresh water available, maintain the usual feeding routine and continue prescribed medication unless your veterinarian advises otherwise. Do not begin a restrictive diet or use another animal’s diabetes treatment.
The water bowl is a clue, not a diagnostic test. A lasting change deserves investigation, but it does not mean your pet definitely has diabetes. Acting on that observation allows your veterinarian to identify the cause and recommend appropriate care.
Frequently Asked Questions About Diabetes Signs in Cats and Dogs
What Are the First Signs of Diabetes in Cats and Dogs?
Common signs owners notice include increased thirst, increased urination and weight loss despite a normal or increased appetite. There is no fixed order in which these appear. Some pets are diagnosed before every typical sign becomes noticeable.
Does Drinking More Water Always Mean My Pet Has Diabetes?
No. Weather, activity, diet, medication and several medical conditions can affect drinking. A persistent, unexplained increase should be assessed, especially when accompanied by changes in urination, appetite or weight.
Can a Pet Have Diabetes and Still Seem Happy?
Yes. A pet may remain interested in meals, walks or play while diabetes is developing. Normal behaviour does not rule out illness when drinking, urination or body weight has changed.
Should I Limit Water If My Pet Is Urinating More?
No. Restricting water does not treat the cause and can worsen dehydration. Keep fresh water freely available and ask your veterinarian about the increased drinking and urination.
How Much Water Is Too Much?
There is no single bowl volume that applies to every pet. Body weight, food moisture, temperature, activity and health all affect water needs. A sustained change from your pet’s usual pattern is worth reporting. A measured 24-hour intake can help your veterinarian interpret the change, but do not delay an appointment to obtain it.
Can Indoor Cats Develop Diabetes?
Yes. Staying indoors does not prevent diabetes. Increasing age, obesity and physical inactivity are among the relevant risk factors in cats. Indoor cats still need appropriate nutrition, activity and routine veterinary care.
Can a Normal-Weight Pet Have Diabetes?
Yes. Excess body weight is an important risk factor, particularly in cats, but diabetes also occurs in lean animals. Some pets have already lost weight by the time they are diagnosed.
Does High Blood Sugar Automatically Confirm Diabetes?
No. Stress can temporarily increase blood glucose, particularly in cats. Your veterinarian interprets glucose measurements alongside symptoms, urine findings and, when needed, additional tests such as fructosamine.
When Do Possible Diabetes Symptoms Become an Emergency?
Vomiting, loss of appetite, marked weakness or rapid deterioration require urgent veterinary advice, especially after increased thirst and weight loss. Collapse, difficulty standing or abnormal breathing warrant immediate emergency assessment. Diabetic ketoacidosis is one possible cause, but other serious illnesses can produce similar signs.
Can Diabetes in Cats and Dogs Be Managed Successfully?
Many pets do well with an individual treatment plan and regular monitoring. Dogs generally need lifelong insulin. Some cats can achieve remission, although this is not guaranteed and does not remove the need for continued monitoring. Treatment decisions and medication changes should always be guided by the veterinarian.
References
Source | Full URL |
Cornell University College of Veterinary Medicine — Feline Diabetes | |
Cornell University College of Veterinary Medicine — Diabetes in Dogs | |
Cornell University College of Veterinary Medicine — Managing Canine Diabetes | |
American Veterinary Medical Association — Diabetes in Pets | |
American Animal Hospital Association — Diabetes in Dogs and Cats: Symptoms, Diagnosis, and Treatment | |
International Cat Care — 2025 Consensus Guidelines on the Diagnosis and Management of Diabetes Mellitus in Cats | |
PDSA — Why Is My Dog Drinking Lots of Water and Weeing More Than Usual? | |
Mezitli Mersin Vetlife Veterinary Clinic |
Comments