What Is Feline Diabetes?
Feline diabetes (Diabetes Mellitus, DM) is primarily Type 2 diabetes, similar to Type 2 diabetes in humans, caused by a combination of insulin resistance and beta-cell dysfunction. According to data from the Journal of Veterinary Internal Medicine(Rand et al., 2004), the incidence of feline diabetes has been steadily rising over recent decades, currently estimated to affect approximately 0.5–2% of cats, with obesity and advanced age being the most significant risk factors.
Risk Factors
| Risk Factor | Description |
|---|---|
| Obesity | Obese cats are 3.9 times more likely to develop diabetes than cats of normal weight (Scarlett & Donoghue, 1998) |
| Age | Middle-aged to senior cats (over 8 years old) are at higher risk |
| Breed | Burmese cats have a higher risk (Rand et al., 2004) |
| Sex | Male cats are approximately twice as likely to be affected as female cats |
| Sedentary Indoor Lifestyle | Lack of exercise increases insulin resistance |
| Long-term Corticosteroid Use | Corticosteroids raise blood glucose levels and induce insulin resistance |
Typical Symptoms of Diabetes
- Increased Thirst and Urination (PU/PD): The most common early symptom. Elevated blood glucose overwhelms the kidneys' ability to reabsorb glucose, resulting in osmotic diuresis
- Weight Loss: Appetite may be normal or even increased, but the body cannot effectively utilize glucose and begins breaking down fat and muscle
- Changes in Appetite: Appetite may increase initially (polyphagia), then decrease in later stages
- Hind Limb Weakness (Plantigrade Posture): This is a characteristic sign of diabetic neuropathy— the cat walks with its hocks touching the ground (normal cats walk on their toes). According to research in the Journal of Veterinary Internal Medicine (Mizisin et al., 2002), approximately 10% of diabetic cats develop this symptom
- Dull Coat: Overall condition deteriorates
Emergency Warning: If diabetes is left untreated or poorly controlled, it may progress to Diabetic Ketoacidosis (DKA), with symptoms including severe vomiting, dehydration, lethargy, and fruity-smelling breath. DKA is a medical emergency requiring immediate hospitalization.
How Is It Diagnosed?
According to the AAHA Diabetes Management Guidelines for Dogs and Cats (2018), a diagnosis of diabetes requires all of the following:
- Persistent Hyperglycemia: Fasting blood glucose > 250 mg/dL (Note: Stress-induced hyperglycemia in cats can exceed 300 mg/dL and must be ruled out)
- Glucosuria: Glucose present in the urine
- Clinical Signs: Increased thirst and urination, weight loss, etc.
Fructosamine testing reflects the average blood glucose over the past 2–3 weeks, helping to differentiate between stress-induced hyperglycemia and true diabetes.
Treatment and Management
Insulin Therapy
Most diabetic cats require daily insulin injections. According to ISFM guidelines, commonly used insulin types for cats include Glargine and PZI (Protamine Zinc Insulin), typically administered as twice-daily subcutaneous injections. Owners can learn to administer injections at home after proper training.
Dietary Management
According to a study published in the Journal of Feline Medicine and Surgery (Bennett et al., 2006), a low-carbohydrate, high-protein diet can significantly improve blood glucose control in diabetic cats. The study found that cats on a low-carbohydrate diet had a higher rate of diabetic remission.
- Choose wet food with carbohydrate content < 10% (DMB)
- Feed on a consistent schedule and in measured portions, timed with insulin injections
- Avoid high-carbohydrate dry food
Possibility of Diabetic Remission
Unlike dogs, cats with diabetes have a possibility of remission. According to a study in the Journal of Veterinary Internal Medicine (Roomp & Rand, 2009), with aggressive insulin therapy combined with a low-carbohydrate diet, approximately 60–80% of newly diagnosed diabetic cats can achieve remission (no longer requiring insulin injections). Early aggressive treatment is key to improving remission rates.
Home Monitoring
- Home Blood Glucose Monitoring: Using a pet-specific glucometer, blood can be drawn from the ear margin to more precisely adjust insulin dosages
- Observe Clinical Signs: Monitor water intake, urine output, appetite, weight, and energy levels
- Watch for Hypoglycemia: Insulin overdose can cause hypoglycemia, with symptoms including weakness, trembling, and disorientation. If this occurs, immediately rub honey or sugar water on the gums and seek veterinary care
References
- Rand, J.S. et al. (2004). Canine and feline diabetes mellitus: Nature or nurture? Journal of Nutrition, 134(8), 2072S-2080S.
- Bennett, N. et al. (2006). Comparison of a low carbohydrate-low fiber diet and a moderate carbohydrate-high fiber diet in the management of feline diabetes mellitus. Journal of Feline Medicine and Surgery, 8(2), 73-84.
- Roomp, K. & Rand, J.S. (2009). Intensive blood glucose control is safe and effective in diabetic cats using home monitoring and treatment with glargine. Journal of Feline Medicine and Surgery, 11(8), 668-682.
- Mizisin, A.P. et al. (2002). Feline diabetic neuropathy. Journal of Veterinary Internal Medicine, 16(6), 692-701.
- AAHA. (2018). Diabetes Management Guidelines for Dogs and Cats.