FR
ENWhat is feline diabetes?
Diabetes mellitus is a chronic disease caused by an insulin deficiency, the hormone produced by the pancreas that allows cells to use glucose as energy. Without functional insulin, glucose builds up in the blood (hyperglycemia) and spills into the urine (glycosuria). A diabetic cat urinates excessively, drinks more, and loses weight despite often having an increased appetite.
Type 1: Insulin-dependent
Accounts for 65–76% of cases in cats. The pancreas no longer produces enough insulin (beta cell destruction). The cat will require insulin injections for life. This type is analogous to human type 1 diabetes.
Type 2: Non-insulin-dependent
Less common in cats. The pancreas still produces insulin but cells no longer respond properly (insulin resistance). In some cases, strict dietary management can reduce insulin requirements or even allow remission.
Uncomplicated diabetes
Clinically stable cat that can still eat, drink, and move around. Classic symptoms are present (polyuria, polydipsia, polyphagia, weight loss) but without serious complications. A favorable response to treatment is expected.
Complicated diabetes (ketoacidosis)
Without treatment, the body breaks down fats for energy, producing acidic ketone bodies (diabetic ketoacidosis). This stage is a medical emergency: vomiting, intense lethargy, dehydration, sweet-smelling breath, collapse. Urgent hospitalization is required.
Diabetes primarily affects castrated male cats over 7 years old and overweight cats. Burmese and some Asian breeds show a genetic predisposition. Early management significantly improves the prognosis.
Signs and symptoms
Symptoms of diabetes develop gradually and can be subtle at first. A cat that urinates more abundantly, drinks more, or loses weight despite a good appetite warrants prompt veterinary evaluation.
Early stage
- •Increased thirst (polydipsia)
- •Increased urine volume (polyuria)
- •Increased appetite (polyphagia)
- •Progressive weight loss despite good appetite
- •Wetter litter box than usual
- •Mild lethargy or reduced activity level
Intermediate stage
- •Plantigrade posture: walking on heels, low shuffling gait
- •Cataracts (lens opacity, less common than in dogs)
- •Pronounced lack of energy, play abandoned
- •Occasional vomiting
- •Dull, matted coat (lack of grooming)
- •Noticeable muscle loss, visible wasting
Advanced stage, emergency
- •Repeated or uncontrollable vomiting
- •Complete refusal to eat or drink
- •Severe dehydration
- •Dyspnea (difficulty breathing)
- •Sweet or fruity breath (ketone odor)
- •Collapse or comatose state
Hypoglycemia: When to seek immediate help?
Hypoglycemia (blood sugar too low) is the most common acute complication in insulin-treated diabetic cats. It typically occurs if the cat hasn't eaten after an injection or if the dose is too high. Seek immediate help if your cat shows:
- Sudden weakness or limb trembling
- Staggering, loss of balance, or unsteady gait
- Seizures or involuntary muscle contractions
- Disorientation, blank stare, abnormal behavior
- Comatose state or loss of consciousness
- Sudden collapse
How is the diagnosis made?
Diabetes diagnosis relies on demonstrating persistent hyperglycemia combined with glycosuria. However, the stress of a veterinary visit can cause transient hyperglycemia in cats, which is why several complementary tests are needed to confirm the diagnosis.
Clinical examination and history
Assessment of general condition, weight, posture (plantigrade?), hydration, and coat quality. Collection of owner-reported symptoms (duration, progression, appetite, water intake, urination).
Blood glucose and glycosuria
Blood glucose measurement: a persistent value above 14–16 mmol/L is strongly suggestive. Detection of glucose in the urine (glycosuria) via urine dipstick test.
Serum fructosamine
Fructosamine reflects the average blood glucose over the preceding 2–3 weeks. It is not affected by visit stress and distinguishes true diabetes from transient hyperglycemia. This is the key test to confirm the diagnosis.
Urine culture and complete urinalysis
Diabetes predisposes cats to bacterial urinary tract infections, often silent. A urine culture is routinely recommended at diagnosis. Complete urinalysis also assesses urine density, ketone bodies, and abnormal cells.
X-rays and complete blood panel
Blood panel (CBC, biochemistry) to evaluate kidney, liver, and pancreatic function, and detect complications or concurrent diseases. X-rays or abdominal ultrasound to assess the pancreas, kidneys, and detect other abnormalities.
Treatment and management
Feline diabetes treatment rests on three pillars: insulin therapy, diet, and monitoring. The goal is to maintain blood glucose within an acceptable range so your cat can live comfortably without acute complications.
- Subcutaneous injections: insulin is injected under the skin twice daily, always after the cat has eaten. The technique is straightforward and most owners adapt quickly.
- Insulin type: your veterinarian will determine the most appropriate insulin type (e.g., Caninsulin, glargine, detemir) based on your cat's individual needs.
- Dose adjustments: the initial dose is conservative and gradually adjusted based on glucose curves. Never change the dose without veterinary advice, overdosing can cause severe hypoglycemia.
- Therapeutic diet: a wet, low-carbohydrate, high-protein diet is strongly recommended. It reduces glucose spikes and can decrease insulin requirements.
- Fixed mealtimes: meals must be given at fixed times, just before insulin injections. A cat that has not eaten should not receive an injection without veterinary advice.
- Glucose curves: blood glucose measured every 2 hours over 12 hours to evaluate insulin effectiveness and adjust dosing. Can be done at the clinic or increasingly at home with a glucometer.
- Regular fructosamine: measured every 4–8 weeks to assess medium-term glycemic control and adjust treatment.
- Check-up visits: frequent veterinary visits at the start (every 7–14 days), then spaced out according to stability (every 4–12 weeks).
- Diabetic remission: in some cats (especially early-diagnosed Type 2), strict glycemic control and appropriate diet can lead to remission: the cat no longer needs insulin for months to years. This is not a cure, but it is possible.
What to expect?
The prognosis for feline diabetes depends on how early the diagnosis is made, the type of diabetes, the presence or absence of complications, and owner involvement in daily management. It is manageable, sometimes with possible remission.
Diabetes is not a death sentence. Thousands of diabetic cats lead happy, active lives. Owner involvement is the single most important factor in treatment success. Our team is here to support you every step of the way.
Home management tips
Things to do
- Give insulin at the same time each day, always after the cat has eaten
- Offer the prescribed diet (wet, low-carbohydrate) at fixed meal times
- Keep fresh water easily accessible at all times
- Monitor daily: appetite, water intake, behavior, litter box
- Keep a log (notebook or app) of doses, meals, and observations
- Measure blood glucose at home if your veterinarian has shown you how
- Designate one person responsible for injections to ensure consistency
- Weigh your cat regularly (every 1–2 weeks at first)
- Maintain a calm environment and stable routine to minimize stress
- Keep corn syrup (Karo) or honey on hand in case of hypoglycemia
Things to never do
- Never inject insulin if the cat has not eaten, contact your veterinarian
- Never change the insulin dose without consulting your veterinarian
- Never give a second injection if you are unsure whether the first was given (risk of overdose)
- Never feed standard carbohydrate-rich kibble without veterinary approval
Always
- Keep scheduled check-up visits and blood tests (fructosamine) as planned
- Contact the clinic if the cat is not eating, vomiting, or showing signs of hypoglycemia
- Inform your veterinarian of any changes in behavior or general condition
Frequently asked questions
Is feline diabetes curable?
What is plantigrade posture and is it serious?
How do I give insulin injections at home?
What should I do if my cat doesn't eat on injection day?
How long will my cat live with diabetes?
This guide is provided for informational and educational purposes only. It does not constitute veterinary medical advice and is not a substitute for a consultation with a qualified veterinarian. Every animal is unique and its health must be assessed individually. If you have concerns about your pet's health, contact our clinic or consult a veterinarian without delay.
Is your cat showing signs of diabetes?
A prompt diagnosis and appropriate treatment are essential. Our veterinary team is here to evaluate your cat, establish a personalized treatment plan, and guide you through home management.