What does a diabetic episode (hypoglycaemia) look like in cats?

Hypoglycaemia — blood glucose falling too low — is the main risk of insulin therapy. Signs include weakness, wobbliness, trembling or twitching, glassy eyes, confusion, and in severe cases seizures or loss of consciousness. It can occur if a cat receives their insulin dose but then does not eat, if the dose is too high, or if the cat is in early remission and glucose is normalising. If you suspect hypoglycaemia, rub a small amount of corn syrup or honey on the cat's gums and contact your vet immediately. Never give insulin to a cat that has not eaten. Keep your vet's emergency contact details accessible at all times.

By Reena Scot | Jun 27, 2026

Diabetes in Cats: Signs, Diagnosis and Long-Term Management

Q: What are the signs of diabetes in cats?

The four classic signs of diabetes in cats are increased thirst (polydipsia), increased urination (polyuria), increased appetite (polyphagia), and weight loss — often described as the 'PU/PD plus weight loss despite eating well' pattern. Owners often notice the litter box is significantly wetter than normal, that the cat is drinking more than usual, or that despite eating enthusiastically the cat is losing weight. In advanced or uncontrolled diabetes, a cat may develop a plantigrade stance — walking flat on the hocks (the ankle joints) rather than on the toes — which is caused by diabetic neuropathy affecting the hind legs. Lethargy, vomiting, and loss of appetite can indicate diabetic ketoacidosis, a serious emergency.

Q: Can diabetes in cats be cured?

Feline diabetes is not cured in the conventional sense, but a significant proportion of cats — estimates range from 25% to over 50% — achieve diabetic remission, meaning they can maintain normal blood glucose levels without insulin after an initial treatment period. Remission is more likely in cats diagnosed early before significant pancreatic damage has occurred, cats whose diabetes is secondary to another treatable condition (such as steroid administration or hypersomatotropism), and cats placed on a low-carbohydrate diet promptly after diagnosis. Even cats that do not achieve full remission can live long, comfortable lives with ongoing insulin management.

Q: How is cat diabetes treated?

The cornerstone of feline diabetes management is twice-daily insulin injections, typically given under the skin at the scruff of the neck. Most owners, despite initial anxiety, become comfortable with this quickly. Diet plays a critical role — low-carbohydrate, high-protein wet food diets significantly improve blood glucose regulation in cats and can reduce or eliminate insulin requirements in some cases. Regular blood glucose monitoring — either by the vet or at home using a glucose meter — is necessary to adjust insulin doses appropriately. Your vet will establish a monitoring schedule based on your cat's stability. Oral diabetes medications used in human medicine are generally not effective in cats.

Q: What diet should a diabetic cat eat?

A low-carbohydrate, high-protein wet food diet is strongly recommended for diabetic cats. Cats are obligate carnivores with very limited ability to process dietary carbohydrates — high-carb dry foods cause significant post-meal blood glucose spikes that make diabetes harder to control. Wet foods are inherently lower in carbohydrates than dry kibble. Several prescription diabetic cat diets are available from vets. The transition to a low-carb diet should be done gradually and in consultation with your vet, as improved glucose regulation after a diet change may require insulin dose adjustment to avoid hypoglycaemia.

Diabetes in cats — signs, diagnosis, insulin management and diet guide

Reviewed by Dr. Ameer Hamza, DVM

Feline diabetes is one of the more common endocrine conditions in domestic cats, particularly affecting middle-aged to older, neutered male, and overweight individuals. It is a serious condition but — crucially — it is manageable. Many diabetic cats live long, comfortable lives with appropriate treatment, and a significant proportion achieve diabetic remission altogether with early intervention and the right diet. This guide covers how to recognise the signs, what the diagnosis involves, and what long-term management looks like in practice.

What Is Feline Diabetes?

Diabetes mellitus in cats is a condition in which either the pancreas produces insufficient insulin (the hormone that enables cells to absorb glucose from the blood) or the body's cells respond inadequately to insulin — a state called insulin resistance. The result is persistently elevated blood glucose levels. In cats, Type 2 diabetes — characterised by relative insulin deficiency combined with insulin resistance — is the most common form, and it shares many features with Type 2 diabetes in humans. Unlike in dogs (where Type 1 insulin-deficient diabetes predominates), feline Type 2 diabetes is strongly associated with obesity, high-carbohydrate diets, and sedentary indoor lifestyle. Treating these risk factors can, in some cats, reverse the condition.

Risk Factors

The most significant risk factors for feline diabetes are obesity, advancing age (over seven years), male sex, neutered status, physical inactivity (indoor-only cats), high-carbohydrate dry food diets, and long-term glucocorticoid (steroid) administration. Acromegaly — a condition caused by excess growth hormone from a pituitary tumour — is an underdiagnosed cause of insulin-resistant diabetes in cats and should be considered in cats that require very high insulin doses to achieve control. Hypersomatotropism (excess growth hormone) causes physical changes including a slightly broad-faced, enlarged appearance and can be confirmed with IGF-1 blood testing.

Recognising the Signs

The classic signs are increased thirst, increased urination, increased appetite, and weight loss despite eating well. In practical terms: the litter box is dramatically wetter than normal; the water bowl empties faster; the cat is begging for food constantly but visibly losing weight and muscle mass. The coat may become poor and unkempt. Weakness in the hind legs — a plantigrade stance where the cat walks on their hocks rather than their toes — is a sign of diabetic peripheral neuropathy and indicates advanced or long-standing uncontrolled disease. Diabetic ketoacidosis (DKA), which occurs when the body breaks down fat in the absence of usable glucose, causes vomiting, lethargy, loss of appetite, and a sweet or fruity smell on the breath. DKA is a veterinary emergency.

Diagnosis

Diagnosis involves blood and urine glucose measurement. The challenge in cats is that stress hyperglycaemia — a temporary elevation in blood glucose caused by the stress of a vet visit — can mimic diabetes on a single blood test. A single elevated blood glucose reading in a cat that shows no symptoms should be interpreted cautiously. Vets use a combination of: fasting blood glucose; fructosamine, which measures average blood glucose over the preceding 2–3 weeks and is not affected by acute stress; and urinalysis showing persistent glucose in the urine (glucosuria). The combination of these tests, plus clinical signs, establishes the diagnosis reliably.

Treatment: Insulin Therapy

The cornerstone of feline diabetes treatment is subcutaneous insulin injection, typically twice daily at 12-hour intervals around mealtimes. The dose is established by the vet and adjusted based on glucose monitoring over time. Cat owners often express significant anxiety about giving injections, but with practice most find it straightforward — the needles are very fine, and most cats react minimally or not at all. The insulin must be kept refrigerated and gently rolled (not shaken) before use. Never give the insulin dose if the cat has not eaten — hypoglycaemia (dangerously low blood glucose) is the main risk of therapy, and a cat that misses a meal needs a vet consultation before the next dose.

Diet: The Critical Component

Diet is arguably as important as insulin in feline diabetes management. Cats have a very limited ability to process dietary carbohydrates — their digestive physiology is adapted to a high-protein, low-carbohydrate ancestral diet. High-carbohydrate dry food diets cause significant post-meal blood glucose spikes that make diabetes very difficult to control. Transitioning a diabetic cat to a low-carbohydrate, high-protein wet food diet dramatically improves blood glucose stability and significantly increases the chance of achieving diabetic remission. Several prescription diabetic diets exist; home-cooked or raw diets may also be appropriate but must be nutritionally balanced. Diet changes in diabetic cats must be coordinated with insulin dose adjustment to avoid hypoglycaemia.

Home Monitoring

Home blood glucose monitoring — using a small lancet on the ear margin and a glucose meter adapted for cats — allows owners to check blood glucose levels at home between vet visits. This significantly improves diabetes management by detecting trends, identifying when doses need adjustment, and confirming remission. Your vet can teach the technique and advise which meter to use. Many diabetic cat owners who start home monitoring find it empowers them to manage their cat's condition much more proactively.

Frequently Asked Questions

What are the signs of diabetes in cats?

Increased thirst, increased urination, increased appetite, and weight loss are the classic signs. Hind leg weakness (plantigrade stance) indicates diabetic neuropathy.

Can diabetes in cats be cured?

Remission is achievable in 25–50% of cats, particularly with early diagnosis, low-carbohydrate diet, and good insulin management. Not a cure but a sustainable resolution requiring ongoing monitoring.

How is cat diabetes treated?

Twice-daily subcutaneous insulin injections plus a low-carbohydrate wet food diet. Regular blood glucose monitoring to adjust insulin doses. Oral medications used in human diabetes are not effective in cats.

What does a hypoglycaemic episode look like?

Weakness, wobbling, trembling, confusion, glassy eyes. Rub honey or corn syrup on the gums and contact a vet immediately. Never give insulin to a cat that has not eaten.

What diet should a diabetic cat eat?

Low-carbohydrate, high-protein wet food. High-carb dry food makes blood glucose control much harder. Transition gradually in coordination with insulin dose adjustment.

For comprehensive guidance on cat health, see the complete cat care guide.

Disclaimer: This article is for educational purposes only. Diabetes in cats must be diagnosed and managed by a licensed veterinarian. Never adjust insulin doses without veterinary guidance.

For a full overview of cat health, nutrition, behaviour, and grooming, see the complete cat care guide.

About the Author

Reena Scot Pet Care Expert & Certified Feline Specialist

Reena has over a decade of experience in feline health, behaviour, and nutrition. She has worked with animal shelters, veterinary clinics, and cat adoption programmes, helping owners make informed decisions about care, diet, and long-term wellness for their cats.

✓ Veterinary Reviewed

Dr. Ameer Hamza, DVM Companion Animals (Cats, Dogs, Birds, Fish) Manj Pets & Veterinary Clinic — Lahore, Pakistan

Dr. Ameer Hamza is a Lahore-based veterinarian practising at Manj Pets & Veterinary Clinic. He specialises in companion animal care including preventive health, nutrition, and clinical treatment for cats and dogs.

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Reviewed for medical accuracy — not a substitute for professional veterinary advice. Learn about our review process.