Feline Diabetes: Symptoms and Management

WeightQ&AMeongsiljang Veterinary Advisory Board

We’ve compiled the essential information every cat owner should know about feline diabetes, including its main symptoms, causes, insulin therapy, and dietary management.

Key Facts About Feline Diabetes

Feline diabetes is a condition in which blood sugar levels rise due to insufficient insulin or impaired insulin function. Typical early signs include drinking significantly more water than usual, a sudden increase in urine output, and weight loss despite a normal or increased appetite. The most common form resembles type 2 diabetes in humans and is particularly prevalent in overweight middle-aged and senior cats. With early detection and appropriate management, some cats can achieve remission, maintaining normal blood glucose levels without insulin therapy.

What Causes Feline Diabetes?

The most common cause of diabetes in cats is obesity. Overweight or obese cats develop increased insulin resistance due to substances secreted by fat tissue, and damage to insulin signaling pathways significantly raises their risk of developing diabetes. Most cases of feline diabetes resemble type 2 diabetes in humans. It is more common in older cats, and a sedentary lifestyle can lead to obesity, further increasing the risk. Long-term use of medications such as steroids (glucocorticoids) can induce insulin resistance and trigger diabetes. Additionally, chronic hyperglycemia itself can worsen diabetes through "glucotoxicity," which damages pancreatic beta cells and insulin-target tissues. Cats with concurrent conditions such as pancreatitis also require careful monitoring.

Suspect Diabetes If You Notice These Symptoms

Increased water intake: Your pet may empty its water bowl more frequently than usual or seek out water from the faucet.

Increased urination: The litter box may become damp more quickly, and urine clumps may appear noticeably larger.

Weight loss: Despite eating normally, your pet may gradually lose weight and muscle mass.

Weakness in the hind legs: You may notice a "plantigrade gait," where your pet walks with its hocks touching the ground.

Changes in coat condition: The fur may lose its shine, become matted, or appear greasy.

Decreased energy: Your pet may show less interest in play and spend more time sleeping.

A gray cat drinking water from a water purifier in the living room

Go to the Vet Immediately If These Symptoms Appear

If your pet is vomiting repeatedly, refusing to eat entirely, or is so lethargic that they won’t move, it could be diabetic ketoacidosis. This is a medical emergency. Delaying treatment can be life-threatening, so you must take your pet to a veterinary clinic immediately. A sweet, fruity odor coming from the mouth is also a sign of ketoacidosis.

How Is Diabetes Diagnosed at the Veterinary Clinic?

Veterinarians diagnose diabetes through blood and urine tests. A diagnosis is confirmed when blood glucose levels remain consistently elevated and glucose is detected in the urine. However, cats commonly experience "stress-induced hyperglycemia," a temporary spike in blood sugar caused by the stress of a veterinary visit. Therefore, it is important to also perform a fructosamine test to assess the average blood glucose level over the past two to three weeks. This test helps distinguish between stress-induced hyperglycemia and true diabetes.

A cat being examined by a veterinarian on the examination table at an animal hospital.

Insulin Therapy Is Easier Than You Think

Most diabetic cats require insulin injections twice a day. Your veterinarian will determine the appropriate type and dosage of insulin based on your cat’s weight and blood glucose levels. Although injections may seem daunting at first, insulin-specific syringes have extremely fine needles, so most cats tolerate them well with minimal resistance. To administer the injection, gently lift the skin at the back of the neck and deliver the dose subcutaneously. It is important to give the injection at the same time each day. The timing of meals relative to the injection may vary depending on the prescribed insulin type, so always follow your veterinarian’s specific instructions for administration.

A caregiver comfortably holding a cat at home while preparing an insulin injection.

Dietary Management Is Half the Treatment

For diabetic cats, a high-protein, low-carbohydrate diet is essential. Veterinary studies have shown that diets with a very low proportion of calories from carbohydrates (less than approximately 6%) can increase the rate of diabetes remission. What matters most is the carbohydrate content, not whether the food is wet or dry. In fact, prescription diabetic diets formulated to be high in protein and low in carbohydrates are available in dry form as well. Therefore, it is best to consult your veterinarian to choose an appropriate low-carbohydrate prescription diet. Feeding amount and timing are also important; aim to provide a consistent portion twice daily at set times. For overweight cats, work with your veterinarian to develop a gradual weight-loss plan, as weight management and the resulting improvement in insulin sensitivity are crucial to the success of a low-carbohydrate diet.

Know the Emergency Response for Hypoglycemia

If your pet suddenly becomes unsteady, has seizures, or appears confused while on insulin therapy, it may be experiencing hypoglycemia. In this case, apply a small amount of honey or syrup to the gums and contact your veterinarian immediately. Hypoglycemia can become dangerous much more quickly than hyperglycemia, so pet owners administering insulin injections should be well-versed in how to handle this situation.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can feline diabetes be cured?

The term "remission" is more accurate than "cure." With aggressive early blood sugar management, some cats can achieve normal blood glucose levels without insulin. The remission rate increases when appropriate insulin therapy is combined with a low-carbohydrate diet.

Can I measure blood sugar at home?

Yes, it’s possible. While you can use a human blood glucose meter, a device specifically designed for pets provides more accurate readings. The test involves taking a small blood sample from the tip of the ear. For safety, it’s best to learn the proper technique from your veterinarian before starting.

Can I give treats to my diabetic cat?

Regular treats are often high in carbohydrates, which can cause a rapid spike in blood sugar. For diabetic cats, it’s best to offer only small amounts of high-protein, low-carbohydrate treats or to use wet food as a treat alternative. Always consult your veterinarian before introducing any new treats.

What should I do if I forgot to give my pet their insulin injection?

If the injection is only 1 to 2 hours late, it’s fine to administer it right away. However, if a significant amount of time has passed, it’s safer to skip that dose and resume at the next scheduled time. Never give a double dose to make up for a missed one. If you often forget, set an alarm as a reminder.

How much does diabetes treatment cost?

While costs vary by clinic, insulin and regular check-ups are the main expenses. For the most accurate estimate, consult your veterinarian directly. Proactive management in the early stages can lead to remission, reducing long-term financial burden.

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References

[1] Rand JS et al., Current understanding of feline diabetes mellitus: part 1, pathogenesis, Journal of Feline Medicine and Surgery, 2013

[2] Nelson RW, Couto CG, Small Animal Internal Medicine, 6th Edition, Elsevier, 2019

[3] Feldman EC et al., Canine and Feline Endocrinology, 4th Edition, Saunders, 2015

[4] Roomp K, Rand J, Intensive blood glucose control is safe and effective in diabetic cats using home monitoring and treatment with glargine, Journal of Feline Medicine and Surgery, 2009