🩺 Vet ReviewedBy Reviewer Dr. Ashim Sarkar, BVSc & AH· Last reviewed Aug 1, 2026

Diabetes in Cats: Early Signs and When to See a Vet

Creator: Dr. Ashim Sarkar
Published: 2026-08-01T00:00:00.000Z

Quick Answer

Diabetes in cats is a condition where the body cannot control blood sugar properly. The early signs are drinking more water, urinating more, weight loss despite a good appetite, and a duller coat. A later cat-specific sign is a flat-footed, dropped-hock walk. Watch for these changes and see a vet, who confirms diabetes with blood and urine tests. Caught early, many cats do very well.

Key Takeaways

The classic early signs of feline diabetes are drinking more, urinating more, and losing weight even though the cat is eating normally or more than usual.
Weight loss in a cat that still has a good appetite is easy to overlook, and it is one of the most telling early clues.
A cat that starts walking flat on its hocks, with the back legs looking dropped or weak, may have diabetic nerve damage, a later sign worth acting on.
Only a vet can diagnose diabetes, using blood and urine tests. In cats, stress can raise blood sugar on its own, so a vet may add a fructosamine test to be sure.
Caught early, many cats do well with insulin and a diet change, and some even go into remission. A cat that stops eating, vomits, or becomes weak with sweet or acetone-smelling breath is an emergency, go now.

A tabby cat resting on a soft surface looking calm and a little tired

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Reviewed by Dr. Ashim Sarkar, BVSc & AH, veterinarian with 2.5 years of hands-on experience in small animal practice. This content is for informational purposes only and does not constitute veterinary advice. Always consult a licensed veterinarian for your pet's health concerns.

What diabetes in cats actually is

Diabetes mellitus is a condition where a cat's body cannot properly control the level of sugar in the blood. Normally the pancreas makes insulin, a hormone that lets cells take sugar out of the blood and use it for energy. In diabetes there is too little insulin, or the body stops responding to it, so sugar builds up in the blood while the cells go hungry. According to the Cornell Feline Health Center, most diabetic cats have a form similar to type 2 diabetes in people, and it is strongly linked to being overweight. The body then pulls in water and burns fat and muscle for fuel, which produces the classic early signs below.

This page is here to help you spot those signs early. It is not a diagnosis. Only a vet can confirm diabetes, with blood and urine tests. If your cat is showing the changes described here, the next step is a vet visit.

Worried about what you are seeing at home? You can check your cat's symptoms free in the Omelo app in about 30 seconds and get a plain read on whether they point to a vet visit and how urgently.

The classic early signs

Feline diabetes usually announces itself with a group of changes that build up over weeks:

Drinking much more water than usual, and returning to the bowl more often.
Urinating more, which owners often notice as bigger or more frequent clumps in the litter tray.
Losing weight even though the appetite is normal or bigger.
A duller, less-groomed coat, and sometimes a bit less energy.

The extra thirst and urination go together. The surplus sugar spills into the urine and drags water with it, so the cat passes more urine and then drinks more to keep up. A heavier litter tray and a water bowl that empties faster are among the earliest and most catchable clues.

Why weight loss with a good appetite is the sign people miss

Owners often expect a sick cat to go off food, so a diabetic cat that is still eating well, or even more than before, does not raise alarm. That is exactly the pattern to watch for. Because the cells cannot use the sugar in the blood, the body burns fat and muscle instead, so the cat slowly loses weight while still eating. A cat that clears its bowl yet is feeling bonier along the spine and hips is showing one of the most telling early clues of diabetes. Cats hide weight loss well under their coats, so run your hands over your cat now and then, and if you can, weigh it every few weeks and track the trend.

The dropped-hock walk, a sign specific to cats

One later sign is distinctive to cats and worth knowing. Prolonged high blood sugar can damage the nerves in the hind legs, a problem called diabetic neuropathy. Instead of walking up on its toes, the cat starts walking flat-footed, with the hocks (the ankle joints) dropped low toward the ground, and the back legs may look weak or wobbly. Per the MSD Veterinary Manual, this plantigrade stance is a recognised sign of feline diabetes. It tells you the diabetes has likely been present for a while and needs veterinary attention, and the good news is that it often improves once blood sugar is brought under control.

Later signs of undiagnosed diabetes

If diabetes goes unnoticed, further signs can appear:

Reduced appetite later on, once the cat starts to feel truly unwell.
A greasy, matted, or thinning coat and reduced grooming.
Weakness, sleeping more, and low energy.
Recurring urinary or skin infections that keep coming back.
Dehydration, with sunken eyes and a slower skin-pinch.

These later signs mean the diabetes has probably been present for some time, which is one more reason to act on the early thirst-and-urination pattern rather than waiting.

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When it becomes an emergency

The everyday early signs are not an emergency, but they should not be ignored either. Untreated diabetes can tip into a dangerous complication called diabetic ketoacidosis. Get to an emergency vet right away if your cat:

Stops eating and starts vomiting.
Becomes very weak, wobbly, or collapses.
Seems dull, unresponsive, or is breathing rapidly.
Has breath that smells sweet or like nail polish remover.
Hides and will not come out, which in cats often signals feeling seriously unwell.

This is a go-now situation. It usually happens in cats whose diabetes was undiagnosed or not yet controlled, which is the strongest argument for catching the early signs and starting treatment. In an emergency, go straight to your nearest vet or emergency clinic rather than waiting for anything online.

Which cats are most at risk

Diabetes can affect any cat, but the odds are higher in middle-aged and older cats, in males, and above all in overweight cats. Carrying extra weight is the biggest risk factor a home can actually influence. Neutered indoor cats that get little exercise and are fed freely all day are a common profile. Some breeds, such as the Burmese, appear more prone in certain regions. Long-term use of steroids and some other conditions can also raise blood sugar. Knowing your cat sits in a higher-risk group is a good reason to pay close attention to thirst, urination, and weight.

How vets diagnose it

Diagnosis belongs to your vet and relies on tests you cannot do at home. They measure the level of sugar in the blood and check whether sugar is present in the urine. Cats are a special case here: the stress of a car ride and a clinic visit can push a cat's blood sugar up on its own, a phenomenon called stress hyperglycaemia, so a single high reading does not confirm diabetes. To get around this, vets often run a fructosamine test, a blood test that reflects the average blood sugar over the previous two weeks or so and is not thrown off by a stressful morning. The signs you notice at home are what tell you when to book the visit; the tests are what confirm it.

How it is managed

The encouraging part is that many cats do well once diabetes is diagnosed. Treatment usually combines insulin injections, given under the skin with a very fine needle that most cats barely notice, with a change to a low-carbohydrate, high-protein diet and steady weight control. Your vet sets the plan and monitors it, sometimes with glucose checks, to fine-tune the insulin dose. When feline diabetes is caught early and managed well, some cats go into remission and no longer need insulin, though this is not guaranteed and treatment is often lifelong. Consistency is the whole game: feeding and dosing at similar times each day keeps blood sugar steady. Never start, stop, or change an insulin dose on your own, because sudden changes can be dangerous. If you are ever unsure, call your vet rather than guessing.

Supporting your cat and lowering the risk

You cannot prevent every case, but you can reduce the risk and catch problems early. Keeping your cat at a healthy weight is the single most useful step, since obesity is so closely tied to feline diabetes. Feed measured meals rather than leaving a bowl out all day, encourage activity with play and climbing, and ask your vet about the right diet and portion for your cat. Routine checkups matter most for older and heavier cats, because bloodwork can flag rising sugar before the outward signs are obvious. Knowing your cat's normal weight, appetite, thirst, and litter habits makes it far easier to notice the early drift.

Diabetes versus other senior cat diseases

Increased thirst, more urination, and weight loss are the hallmark of feline diabetes, but they are not unique to it. Two other very common diseases in older cats, chronic kidney disease and an overactive thyroid, can cause almost the same picture, and some senior cats have more than one condition at once. This overlap is precisely why the signs on this page point you to a vet rather than to a home conclusion. Your vet tells these apart with blood and urine tests, sometimes checking thyroid levels and kidney values alongside blood sugar. It is also why a full senior workup, rather than testing for one disease in isolation, is so useful. When you describe the changes you have seen, the tests do the sorting, and the right diagnosis is what points to the right treatment.

Where Omelo fits, and where it does not

Omelo is a free AI symptom checker for dogs and cats that helps you decide when a change needs a vet, and it keeps your cat's baseline, including habits like drinking, weight, and appetite, so you notice a slow shift sooner. If your cat is suddenly drinking and peeing more, losing weight while eating well, or walking oddly on its back legs, you can check the pattern free in the Omelo app and get a clear read on how urgent it looks. What Omelo does not do is diagnose diabetes, prescribe insulin, or replace your vet. Confirming diabetes needs blood and urine tests, and managing it needs a veterinary plan. Use Omelo to catch the early signs and decide when to go, then let your vet confirm and treat.

In India, if you would like a licensed vet to weigh in before you travel, you can book a 15-minute video consultation for ₹349 at vet.beomelo.com. A vet can look at the changes you are seeing and help you plan the next step, including in-person testing when it is needed. If your cat is collapsed, vomiting, or has sweet-smelling breath, skip the app and go to an emergency vet now.

Diabetes in Cats: Frequently Asked Questions

What are the first signs of diabetes in a cat?

The earliest signs are drinking noticeably more water, urinating more so the litter clumps get bigger or more frequent, and losing weight even though the cat is eating normally or more than usual. According to the Cornell Feline Health Center, these signs appear because the body cannot use sugar for energy, so it pulls in water and burns fat and muscle instead. A duller, less-groomed coat often follows.

Can diabetes in cats be an emergency?

The everyday early signs are not an emergency, but they do need a prompt vet visit. Advanced, untreated diabetes can tip into a serious complication called diabetic ketoacidosis, where the cat stops eating, vomits, becomes weak or collapses, and may have breath that smells sweet or like nail polish remover. That is a medical emergency and needs an emergency vet right away.

Why is my diabetic cat walking flat on its back legs?

A cat that walks with its hocks (the ankle joints) dropped low to the ground, in a flat-footed or plantigrade stance, may have diabetic neuropathy, nerve damage caused by prolonged high blood sugar. Per the MSD Veterinary Manual, it shows up as weakness in the hind legs and this distinctive walk. It is a sign the diabetes needs veterinary attention, and it often improves once blood sugar is controlled.

How is diabetes in cats diagnosed?

Only a vet can diagnose it, using a blood glucose test and a urine test that checks for sugar. Cats are a special case because stress and a car ride to the clinic can raise their blood sugar on their own, so a single high reading is not enough. Vets often add a fructosamine blood test, which reflects the average blood sugar over the past couple of weeks, to confirm true diabetes.

Can a cat recover from diabetes?

Many diabetic cats do very well, and some go into remission, meaning they no longer need insulin, especially when the diabetes is caught early and managed with insulin plus a low-carbohydrate diet and weight control. Not every cat achieves remission, and treatment is usually lifelong, but early diagnosis gives the best chance. This is the main reason to act on the early signs rather than wait.

How can I lower my cat's risk of diabetes?

The single most useful step is keeping your cat at a healthy weight, since obesity is a major risk factor for feline diabetes. Feed measured meals rather than leaving food out all day, encourage activity with play, and talk to your vet about the right diet for your cat. Routine checkups, especially for older and overweight cats, help catch early changes before they become obvious.

References

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Dr. Ashim Sarkar, BVSc & AH

Veterinarian · Medical Reviewer

Reviews all clinical and triage content on Omelo. Hands-on small-animal practice experience across vomiting, dermatology, vaccinations, and emergency triage. All Omelo recommendations pass through Dr. Sarkar before publication.

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