Diabetes is turning up more often in Australian 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.
- Walking flat on the hocks rather than up on the toes, known as a “plantigrade stance” — a sign of 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
Cats are among the fastest-growing pets in Australia, and plenty carry a few extra kilos. Weight is the single biggest risk factor: Cornell reports overweight cats are up to four times more likely to develop diabetes than lean cats, because fat tissue drives insulin resistance (Cat Specialist Services). 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.
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 shows the average blood sugar over the previous couple of weeks and helps rule out a one-off stress spike (Cat Specialist Services; Cornell).
Treatment in Australia, and the remission window
Treatment usually means twice-daily insulin injections about 12 hours apart, given at home after meals, alongside a low-carbohydrate, high-protein diet (Animal Diabetes Australia; Cornell). The insulins registered for pets in Australia include Caninsulin — a porcine insulin first registered here in 1990 — and ProZinc (Pet Circle); 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 (Animal Diabetes Australia). With prompt insulin and a strict low-carb diet, many cats — in some studies more than half — reach it, usually within the first few months, and the 2025 international iCatCare consensus guidelines stress that early, tight management gives the best chance. Cornell notes a cat that hasn’t reached remission within about six months will most likely need insulin for life — which is why acting early matters. Expect ongoing costs, too: insulin, a prescription diet and regular blood checks can run to tens of dollars a week, 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. If your cat is still conscious, rub a little honey on the gums and get to a vet straight away (Cornell; Animal Diabetes Australia).
- 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 (Cat Specialist Services; 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. Cats are the pet most likely to reach diabetic remission, 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. Being overweight is the leading risk factor because it drives insulin resistance (Cornell), so keeping your cat lean is one of the few things genuinely within your control.
Can I use human insulin for my cat?
No. Diabetic cats are treated with insulins dosed for pets, such as Caninsulin or ProZinc, and the syringe type must match the product exactly (Pet Circle). 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 Marta Ellison — Marta is a pet-health writer for GoPetr who 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.
