Diabetes is a common hormone disorder in cats, and it is one of the few serious feline illnesses owners can genuinely help turn around. Caught early and managed well, many diabetic cats live full, comfortable lives, and some stop needing insulin altogether. The trouble is that the first signs are quiet and easy to shrug off.
Here is the short version: if your cat is suddenly drinking and weeing more than usual while losing weight despite a healthy appetite, book a vet visit. Those changes together are the classic red flags of diabetes mellitus, according to the Cornell Feline Health Center.
What diabetes actually does to a cat
Diabetes mellitus develops when a cat’s body either stops making enough insulin or its cells stop responding to it properly, so glucose builds up in the blood instead of fuelling the body (Merck Veterinary Manual). Most affected cats have a form much like type 2 diabetes in people, and it is closely tied to carrying too much weight (Cornell Feline Health Center).
The early warning signs to watch for
Keep an eye out for these changes, especially in cats over about seven years old:
- Drinking noticeably more water and leaving larger, heavier clumps in the litter tray (increased thirst and urination).
- Losing weight even though the appetite is normal or increased.
- Seeming flatter and sleepier, with a coat that loses its usual condition.
- Less commonly, walking flat on the hocks rather than up on the toes, known as a “plantigrade stance”, a sign of hind-leg weakness from diabetic nerve damage that needs prompt veterinary attention (Cornell; Australian feline specialists Cat Specialist Services describe the same picture).
Why so many Australian cats are at risk
Plenty of Australian cats carry a few extra kilos, and weight is a major risk factor: Cornell reports obese cats are up to four times more likely to develop diabetes than cats at an ideal weight (Cornell Feline Health Center). Cosy indoor winters, generous feeding and less activity all add up: the same slow weight creep we cover in our guide to preventing winter weight gain in pets. Older, male and less-active cats are at higher risk again, as are cats on steroid medicines (Cornell).
How your vet confirms it
Increased thirst has several possible causes in cats: kidney disease and an overactive thyroid can look similar, which is why our articles on a cat drinking too much water and early kidney disease in cats are worth a read too. Your vet tells them apart with blood and urine glucose tests, plus a fructosamine test that reflects average blood sugar over the previous few weeks and helps rule out a one-off stress spike (Cat Specialist Services; Cornell).
Treatment in Australia, and the remission window
Treatment usually means insulin injections given at home every 12 hours, timed with meals as your vet directs (Animal Diabetes Australia), alongside a low-carbohydrate, high-protein diet (Cat Specialist Services). Options include veterinary insulins such as Caninsulin and ProZinc, and some vets prescribe insulin glargine; the Merck Veterinary Manual lists protamine zinc insulin and glargine as preferred first choices in cats. Newer oral medicines called SGLT2 inhibitors suit some newly diagnosed cats (Cornell). Your vet chooses and doses the right one for your cat.
Now the hopeful part: cats have a real shot at remission, a stretch where they no longer need injections. It is most common in the first few months after diagnosis (Animal Diabetes Australia), and with early, aggressive treatment many cats get there (Cornell). The 2025 international iCatCare consensus guidelines set out current options, including insulin or SGLT2 inhibitors combined with a suitable diet and monitoring plan. Cornell notes a cat that hasn’t reached remission within about six months will most likely need treatment for life, which is why acting early matters. Expect ongoing costs, too: insulin, a prescription diet and regular blood checks all add up, so ask your clinic for a written estimate.
Two emergencies every diabetic-cat owner should know
- Hypoglycaemia (blood sugar too low), usually from too much insulin. Signs include weakness, wobbliness, tremors and, in severe cases, collapse or seizures. Rub a little honey, glucose solution or dextrose gel on the gums and contact a vet straight away (Cornell).
- Diabetic ketoacidosis, where the body starts burning fat for fuel and the blood turns acidic, often showing as vomiting, loss of appetite and a very flat cat. It is a medical emergency that needs hospital care (Cornell).
It pays to find your nearest 24-hour or after-hours clinic now, before you ever need it.
Frequently asked questions
Can a cat recover from diabetes?
Some can. Remission is most common in cats, particularly when insulin and a low-carb diet start soon after diagnosis (Animal Diabetes Australia). Others need insulin long term, and both outcomes are manageable with veterinary support.
Is feline diabetes caused by too many treats?
Not on their own, but weight matters a lot. Obesity is a major risk factor, making diabetes up to four times more likely (Cornell), so keeping your cat lean is one of the few things genuinely within your control.
Can I use human insulin for my cat?
Not unless your vet prescribes it. Some vets do use human-formulated insulins such as glargine in cats (Merck Veterinary Manual), but the type, dose and matching syringe must be set by your vet, as insulins come in different strengths. Never change insulin, dose or brand without your vet.
Key takeaways
- The classic combination is more drinking, more weeing and weight loss despite a good appetite: if you see it, book a vet visit.
- Keeping your cat at a healthy weight is the best way to lower the risk.
- Early treatment gives cats their best shot at remission, so don’t wait and see.
- Learn the signs of hypoglycaemia and know where your nearest emergency vet is.
Written by GoPetr Writer, the GoPetr editorial team, which works from Australian veterinary and welfare sources to make cat and dog care easier to understand. This article is general information only and has been checked against the sources linked above; it is not a substitute for advice from your own vet. Please consult a licensed Australian veterinarian for diagnosis or treatment specific to your cat.
