Diabetes care for pets: insulin schedules, dose logs, and what to tell your vet
This guide is general information and not a substitute for your veterinarian. It doesn't include doses, and insulin amounts and changes are always your vet's decision.
Your cat or dog has been diagnosed with diabetes, and suddenly the day has a new shape: insulin, meals, and the worry that comes with getting them right. It gets easier. The core of managing it is a steady routine and a simple record, so you and your vet can see what's working instead of guessing.
This page is the overview: what to note each day, when a low is an emergency, and how your record helps your vet adjust treatment. Each part links to a fuller guide below.
What diabetes actually means in a cat or dog
Diabetes mellitus means the body can't keep blood sugar in a normal range on its own. Either the pancreas isn't making enough insulin, or the body stops responding to the insulin it makes. Insulin is the hormone that moves sugar out of the blood and into cells, so without enough of it the sugar stays in the blood and the cells go hungry in the middle of plenty.
That's why the classic signs cluster the way they do. Drinking more, weeing more, eating well but losing weight anyway. Sugar spilling into the urine pulls water with it, which is where the thirst comes from, and the weight loss comes from cells burning fat and muscle because they can't reach the sugar. If you've been watching your pet drink and thinking you were imagining it, our guide on how much water a dog should drink shows how to turn that into an actual number.
The treatment is insulin, given as injections, plus a consistent routine around food. Most diabetic dogs need insulin for the rest of their lives. Cats are a different story, and we come back to that below.
What the first few weeks usually look like
The first stretch is the hardest, and it's worth knowing that in advance so it doesn't feel like something's going wrong. Your vet starts at a conservative dose and adjusts from there, because starting low and working up is safer than overshooting. That means the first dose is a starting point, not a verdict, and it may change more than once.
Injections get easier faster than most people expect. The needles are very fine, and the scruff of the neck has few nerve endings. Most cats and dogs stop reacting within a week or two, especially if the injection happens at the same time as something good, like a meal.
Practical things that make the routine hold together: give insulin at the same times each day, feed the same food in the same amounts, and keep the insulin stored the way the packaging says. Roll the bottle gently rather than shaking it if your vet told you to mix it. And decide early who does the evening dose when you're out, because the plan that survives is the one that doesn't depend on one person always being home.
What to write down each day
Insulin and food work as a pair, so the useful record ties them together. Day to day, note:
- The insulin dose and the time you gave it, logged as you give it so there's no "did I?" later.
- The meal, when it was and whether your pet ate normally.
- Any signs of low blood sugar: weakness, trembling, wobbliness, or acting strange.
- Appetite changes, vomiting, or unusual behaviour.
- Weight, and the dates of recent bloodwork.
An entry might read: 08:00, insulin given as prescribed, ate full breakfast, bright and steady. A few words is enough. If you ever can't remember whether you gave a dose, our guide on a missed insulin dose covers what to do next.
When to call your vet
Low blood sugar is the complication to know cold, because it can move fast. Call your vet or an emergency clinic if your pet is weak, wobbly, trembling, or acting confused, and treat collapse or a seizure as a straight emergency. If your pet is still awake and swallowing, your vet will usually have told you to rub a little honey or sugar syrup on the gums and call, and never to put anything in the mouth of a pet that's collapsing. Also call if your pet won't eat and a dose is due, rather than giving it anyway. The full signs are in the hypoglycemia warning signs guide.
The other emergency: when a pet becomes very unwell
Low blood sugar is the fast emergency. There's a slower one worth knowing by name, because it creeps up over a day or two rather than minutes. Diabetic ketoacidosis, usually shortened to DKA, happens when the body has gone so long without usable sugar that it starts breaking down fat for fuel and the by-products build up in the blood.
What you'd notice is a pet who stops eating, vomits, becomes weak or dull, and often has breath that smells oddly sweet or like nail polish remover. A diabetic pet who won't eat and is vomiting needs to be seen the same day, not watched overnight. Call your vet or an emergency clinic.
This is one of the reasons the daily record matters. "She's been quieter and off her food since Tuesday" is a much easier sentence for a vet to act on than "she's not herself today."
What your vet checks at a recheck
Rechecks are frequent early on, then space out once things settle. Knowing what your vet is looking at makes the appointments feel less like a test you might fail.
- Your notes. Doses, appetite, drinking, energy, and any wobbles. This is usually the first thing they ask for.
- Weight. Weight that's stopped dropping is one of the earliest signs treatment is working.
- A glucose curve, where blood sugar is measured at intervals through the day to see how the insulin is behaving. Our guide on running a glucose curve at home covers how that works and why a home curve often reflects a normal day better than one at the clinic.
- Fructosamine, a blood test that reflects average blood sugar over the previous couple of weeks. It's useful when a single reading might mislead, for example in a cat who gets stressed at the vet.
- The clinical picture. How much your pet is drinking, whether the coat looks better, whether the litter tray has gone back to normal.
Bring the record to every one of these. It's the part of the picture nobody else can supply.
Where cats and dogs differ
Both get insulin, but the outlook isn't the same, and it's worth knowing which conversation you're in.
Cats can go into remission. With early treatment and the right diet, some cats stop needing insulin for months or years, because their pancreas gets a break and starts coping again. Diet does real work here, and low-carbohydrate food is a common part of the plan. Remission isn't guaranteed and it can end, so it's something your vet watches for rather than something you aim at alone. Never stop insulin on your own, even if your cat looks well. Careful records are exactly how a vet spots remission safely.
Dogs very rarely go into remission and usually need insulin for life. The goal is a steady, comfortable routine rather than a cure. Diabetes in unspayed female dogs can be affected by hormone cycles, which is one of the things your vet will raise. Cataracts are common in diabetic dogs and can develop quite quickly, so mention it promptly if your dog starts bumping into things or their eyes look cloudy.
Why the record helps your vet
Your vet sees your pet for a few minutes. They set the dose from what happens in the weeks in between, and that's your record. A clear history of doses, meals, weight, and any wobbles lets them adjust treatment faster and more safely, and it's how a home glucose curve becomes readable rather than a page of loose numbers.
Timelines show patterns your memory can't hold. Written down, "I think she's been off her food" becomes "she's eaten half her breakfast four days running," which is something your vet can act on.
Guides in this series
- Hypoglycemia warning signs in dogs and cats
- Missed an insulin dose? What to do next
- At-home glucose curves, step by step
Related guides
- Seizure logging & epilepsy
- Kidney disease (CKD) tracking
- How much water should a dog drink?
- How much water should a cat drink?
Common questions
What if my pet misses a dose?
Never give a double dose to catch up, since that's the classic cause of a dangerous low. Write down the missed time, follow the plan your vet set, and resume the normal schedule at the next dose. When in doubt, give less, not more, and call your vet if you're unsure.
Will my vet accept my home logs?
Yes. A clear, timestamped record of doses, food, and weight is exactly what helps your vet make safe adjustments. It saves guessing in the exam room and often shortens the road to a stable dose.
Can a diabetic cat go into remission?
Some cats do, especially with early, well-managed treatment and the right diet, meaning they may not need insulin for a time. It isn't guaranteed and it can end, so it's a path you follow with your vet, never a reason to stop insulin on your own.
Where this information comes from
This guide is written from living with a chronically ill dog and checked against published veterinary sources. It's general information, not advice for your individual pet. If you want to read further:
- Feline Diabetes, Cornell Feline Health Center, Cornell University College of Veterinary Medicine. An owner-facing overview of diagnosis, insulin treatment, diet, and remission in cats.
- Chronic Kidney Disease, Cornell Feline Health Center. Relevant because kidney disease and diabetes often turn up in the same older cat.
Felova is being built for exactly this, a calm place to log insulin, food, and weight so the picture is there when your vet needs it. It's not out yet. Until then, our printable logs do the same job on paper.
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