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The important points, first
- In dogs, consistent timing and amounts of food and treats matter, along with regular exercise.
- For cats the ideal diet is usually wet, high in protein and low in carbohydrate. Fixed meal times help but are not essential.
- In cats diabetes can go into remission. If nobody notices, insulin becomes too much and blood sugar drops dangerously.
- Lethargy, tremors, an odd gait, weakness, collapse or seizures may mean blood sugar is too low. Follow your veterinarian’s instructions and contact them at once.
- Never increase the insulin dose or frequency without clear instructions from your veterinarian.
Dogs and cats: same name, different diseases
In dogs, diabetes is traditionally regarded as an absolute lack of insulin, because the pancreatic cells that produce it are progressively lost. It mostly affects middle-aged and older dogs. Typical signs are increased thirst and urination, more hunger and weight loss. Left untreated, ketosis and ketoacidosis can develop, with lethargy, weakness, refusal to eat, vomiting and sometimes sweet-smelling breath. With well-established insulin therapy and monitoring, AAHA considers the prognosis favourable.
Diabetic cats are often obese, sedentary and middle-aged or older. Owners notice increased thirst and urination, more hunger, weight loss and lethargy; some cats rest their hocks on the ground because of hind-leg weakness. At first these changes can be slow and go unnoticed, which is why AAHA asks for body and muscle condition to be assessed at every visit. In cats, remission depends on the pancreas recovering once insulin resistance resolves.1257
In dogs: consistency first
The AAHA canine guidelines explain that a diabetic dog can do well on any complete and balanced food, as long as it is fed at consistent times, in appropriate portions, and is palatable enough to keep appetite steady. Treats and exercise should be kept consistent too, and a walk after meals may reduce the rise in blood sugar. Wet foods and higher-fibre diets can help, but the choice depends on the dog’s weight and any other conditions.
Ask your veterinarian for clear instructions on pairing meals with insulin and on what to do if your dog eats little. AAHA advises contacting the veterinarian if the dog does not eat at least half of two consecutive meals. Include treat calories in the daily ration and weigh your dog on the same scale at least once or twice a month. If an overweight dog needs to lose weight, it should not lose more than 2% of body weight per week, and your veterinarian needs to tell this intended loss apart from weight loss caused by poorly controlled diabetes.34
In cats: diet and possible remission
For cats, AAHA prefers wet food and, for most diabetic cats, a diet high in protein and low in carbohydrate. High-fibre diets are not usually recommended. Portioned meals have several advantages, but unlike in dogs they are not essential: a cat can also graze on small amounts through the day. In obese cats weight loss should be gradual, 0.5–2% of body weight per week.
Diabetes in cats can go into remission, meaning the cat no longer needs insulin. AAHA uses an average of about 30% in the United States; most remissions happen within six months and are more likely when causes such as obesity are resolved. The cat is not cured, however, and relapse is common. In unmonitored cats remission may go unnoticed until insulin causes an obvious drop in blood sugar, so monitoring at home and at the clinic matters.67
What to record and when to call
Your veterinarian needs to judge whether diabetes is under control, and observations made at home help. Record appetite, amount eaten, activity and insulin timing, and note weight at regular intervals. In cats, AAHA considers the amount of water drunk over 24 hours a useful measure. Report more thirst, urination or hunger, weight loss, less appetite or a pet that seems unwell.
AAHA asks veterinarians to teach owners to recognise hypoglycaemia: lethargy, sleepiness, strange behaviour, abnormal gait, weakness, tremors, collapse and seizures. Keep your veterinarian’s written instructions on what to do close at hand. Do not put your fingers in the mouth of a hypoglycaemic animal and, if it has seizures, get to a clinic at once. The insulin dose or frequency must never be increased without clear instructions from your veterinarian.48
Sources and checks
Numbers in the text lead to the exact source. Commercial blogs and social posts are not used as evidence.
- 1Veterinary guideline
2026 AAHA Diabetes Management Guidelines for Dogs: Overview of Diabetes Mellitus in Dogs
American Animal Hospital Association · Insulin deficiency from progressive beta-cell loss, age and predisposed breeds, favourable prognosis with treatment and monitoring.
Link checked on 16 Sept 2026 - 2Veterinary guideline
2026 AAHA Diabetes Management Guidelines for Dogs: Recognizing and Diagnosing DM in Dogs
American Animal Hospital Association · Clinical signs, ketosis and ketoacidosis, sweet-smelling breath.
Link checked on 16 Sept 2026 - 3Veterinary guideline
2026 AAHA Diabetes Management Guidelines for Dogs: Dietary Management in Diabetic Dogs
American Animal Hospital Association · Complete food at consistent times, fibre and wet food, treats counted in calories, weight once or twice a month, maximum 2% loss per week.
Link checked on 16 Sept 2026 - 4Veterinary guideline
2026 AAHA Diabetes Management Guidelines for Dogs: Client Education
American Animal Hospital Association · Consistent food, treats and exercise, walk after meals, missed meals, signs of hypoglycaemia, never increase insulin without the veterinarian.
Link checked on 16 Sept 2026 - 5Veterinary guideline
2026 AAHA Diabetes Management Guidelines for Cats: Recognizing DM in Cats
American Animal Hospital Association · Risk factors and profile of the diabetic cat, clinical signs, body and muscle condition assessment at every visit.
Link checked on 16 Sept 2026 - 6Veterinary guideline
2026 AAHA Diabetes Management Guidelines for Cats: Dietary Management
American Animal Hospital Association · Wet food, high-protein, low-carbohydrate diet, portioned meals not essential, gradual weight loss.
Link checked on 16 Sept 2026 - 7Veterinary guideline
2026 AAHA Diabetes Management Guidelines for Cats: Diabetic Remission
American Animal Hospital Association · Remission in cats (about 30% in the US), timing, relapse, remission missed in unmonitored cats.
Link checked on 16 Sept 2026 - 8Veterinary guideline
2026 AAHA Diabetes Management Guidelines for Cats: Client Education
American Animal Hospital Association · Commitment required, what to watch at home, water drunk over 24 hours, signs of hypoglycaemia, never increase insulin without the veterinarian.
Link checked on 16 Sept 2026
This guide does not recommend doses, insulin types or specific diets. Diabetes treatment should be set and changed only by your veterinarian.