Pet diabetes is increasingly common in Macau, especially in older indoor cats and overweight dogs. This guide covers what to watch for, how we diagnose it, daily treatment at home, and the realistic chance of remission in cats.
Diabetes mellitus is one of the most common endocrine diseases we diagnose in adult dogs and cats at Royal Veterinary Center, and the prevalence is climbing in step with rising rates of pet obesity and indoor apartment living. The good news is that with consistent treatment at home, most diabetic pets live full, happy lives, and a meaningful percentage of diabetic cats actually go into remission. This guide explains the early signs to watch for, how we confirm the diagnosis, what day-to-day treatment looks like in a Macau household, and what owners can realistically expect over time.
What diabetes actually is in pets
Diabetes mellitus happens when the pancreas cannot produce enough insulin, or when the body's tissues become resistant to the insulin it does produce. Without enough effective insulin, blood sugar rises, the body's cells cannot use glucose for energy, and the excess sugar spills into the urine. Over time, high blood sugar damages blood vessels, nerves and organs. In dogs, the disease is almost always insulin-dependent (similar to type 1 in humans) and requires lifelong insulin injections. In cats, the disease is more often type 2-like and can sometimes be reversed with aggressive management, especially if caught early and the cat loses weight.
Signs that should prompt a check
The classic early signs are increased thirst, increased urination, weight loss despite a normal or increased appetite, and a dull or unkempt coat. Some cats develop a plantigrade stance — walking on their hocks rather than their toes — which is a sign of diabetic neuropathy. Diabetic pets are also more prone to urinary tract infections because of the sugar in the urine, so recurrent bladder issues can be a clue. In dogs, cloudy eyes from rapid-onset cataracts are common, sometimes appearing within weeks of diabetes developing. Any combination of these signs — especially in an older, overweight indoor pet — warrants a blood and urine test. The earlier we diagnose, the better the long-term outcome, and in cats, the better the chance of remission.
How we confirm the diagnosis
Diagnosis is straightforward: a single blood draw to measure fasting blood glucose, fructosamine (which reflects average blood sugar over the previous 1-2 weeks), and a urine sample to check for glucose and ketones. Persistently elevated fasting glucose above the normal range, combined with glucose in the urine, confirms diabetes. Fructosamine helps us distinguish a stressed cat with a transient glucose spike from a truly diabetic cat, which matters because stress alone can push a cat's blood sugar into the diabetic range. We will also run a full wellness panel to check for concurrent conditions (kidney disease, thyroid disease, pancreatitis) that often accompany diabetes in older pets and need to be managed alongside it.
What daily treatment looks like at home
Treatment has three legs: insulin, diet, and monitoring. Most dogs and cats need twice-daily insulin injections under the skin, given 12 hours apart and just after a meal. The needles are very small and most pets tolerate the injection better than their owners expect — we will teach you the technique in the consultation and you will be doing it confidently by the end of the first week. The diet is typically a high-protein, low-carbohydrate prescription food (different formulations for dogs and cats), fed in measured portions twice daily at insulin time. Monitoring at home is mostly watching for the signs we will train you to recognise: hunger returning, thirst normalising, weight stabilising, and energy improving are all positive. We will also teach you how to spot hypoglycaemia (low blood sugar from too much insulin) — weakness, wobbliness or disorientation — and what to do if it happens.
Prognosis, remission, and what to expect over time
With consistent treatment, the vast majority of diabetic dogs live happy, full lives. Cats do even better on average, and somewhere between 30 and 80 percent of newly diagnosed diabetic cats go into diabetic remission within the first few months if they achieve good glycaemic control and lose weight to a healthy body condition. Remission means the cat no longer needs insulin — at least for a while — and we monitor with periodic bloodwork. Relapse is possible (and more common if weight is regained), so ongoing diet and weight management remain important. We see diabetic patients at least every 3 months once stable, to adjust the insulin dose, recheck fructosamine, and screen for complications. The commitment is real but the results are genuinely worth it — most owners tell us their pet feels like themselves again within weeks of starting treatment.
Key Takeaways
- Pet diabetes is common, manageable, and — in many cats — potentially reversible.
- Increased thirst and urination, weight loss with a good appetite, and a dull coat are the early signs.
- Diagnosis is a fasting blood glucose, fructosamine, and urine test — quick and definitive.
- Treatment is twice-daily insulin, a measured prescription diet, and regular monitoring.
- Cats achieving remission lose weight on a high-protein, low-carb diet and maintain good glycaemic control.