Most diabetic cats have a type 2-like disease, in which insulin resistance gradually wears down the pancreas’s ability to release insulin. Type 1 diabetes is rare in cats. Diagnosis requires evidence that high blood glucose persists, because a single high reading in a stressed cat can be misleading. Treatment is individualized. Insulin is the long-standing mainstay, and a once-daily oral SGLT2 inhibitor is an option for selected newly diagnosed cats that are otherwise stable, with close ketone monitoring. With good care, remission is possible, but it is not a cure.
What type of diabetes cats usually get
Feline diabetes mellitus develops when a cat secretes too little insulin, cannot use insulin effectively, or both. Most cats follow a type 2-like pattern. Insulin resistance places sustained stress on the insulin-producing beta cells, and over time those cells lose the ability to secrete enough insulin. Immune-mediated type 1 disease, in which beta cells are destroyed, is rare in cats.
Several conditions can contribute to insulin resistance or to beta-cell failure:
- Obesity, a common contributor to insulin resistance.
- Other endocrine diseases occurring at the same time, such as hyperthyroidism.
- Pancreatitis, inflammation of the pancreas.
- Insulin-antagonizing medications, including glucocorticoids (steroids) and progestagens.
A risk factor makes diabetes more likely but does not prove it caused a particular cat’s disease, and a cat may have more than one contributor.
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Signs owners notice first
- Drinking and urinating more. When glucose spills into the urine, it draws water with it, so thirst and urine volume rise together.
- Weight loss despite changes in appetite.
- Weakness or lethargy.
- A plantigrade hind-limb stance, in which the cat walks with its hocks resting on the ground.
These signs overlap with other diseases, so a cat showing them needs a veterinary examination and testing rather than a guess.
How veterinarians confirm the diagnosis
Why one high glucose reading is not enough
Stress can raise blood glucose in cats, so a single clinic measurement can mislead in either direction. AAHA’s 2026 Diabetes Management Guidelines for Cats state that a diagnosis in a cat with clinical signs requires evidence of sustained hyperglycemia, meaning glucose that stays high over time.
Tests that show persistent hyperglycemia
- Fructosamine, a blood test for glycated proteins that reflects average glucose. AAHA’s guideline places its window at roughly the previous 7 to 10 days, while Cornell University’s feline guidance describes it as an average over about two weeks that is less affected by a short-term stress response.
- Home glucose monitoring, meaning repeated readings taken at home rather than in the clinic.
- Continuous glucose monitoring, a sensor that tracks glucose across the day.
- Glucosuria testing, checking urine for glucose, which can help show that high glucose is persistent.
Baseline work-up
The initial evaluation typically includes:
- Complete blood count (CBC)
- Chemistry panel and electrolytes
- Urinalysis
- Total thyroxine (T4), to screen for hyperthyroidism
The team also looks for conditions that can coexist with or drive diabetes, including urinary infection, kidney disease, pancreatitis, and hyperthyroidism. If ketosis is present, the case is more complicated and may need urgent hospital care.
Treatment options
Treatment is individualized. The aims are to reduce thirst and urination, stabilize weight and appetite, support quality of life, and avoid hypoglycemia (low blood glucose) and ketosis.
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Insulin
Insulin remains the traditional mainstay. AAHA’s 2026 guideline names glargine U-100 and protamine zinc recombinant human insulin as common choices. The specific product and plan depend on the individual cat, and insulin products differ in duration of action and concentration.
The guideline describes a typical starting reference of 1 unit per cat every 12 hours. This is a clinical starting point for veterinarians, not a dose for owners to apply. The veterinarian sets the dose for each cat and product, and owners should never change an insulin dose on their own.
Match the syringe to the insulin. Cornell University’s feline guidance stresses that U-40 insulin must be drawn with U-40 syringes and U-100 insulin with U-100 syringes. Using the wrong syringe changes the dose delivered, even when the number on the syringe looks correct.
Oral SGLT2 inhibitors
SGLT2 inhibitors are an oral option that increases glucose excretion in the urine. AAHA’s 2026 guidance notes that two of them are licensed in the United States for newly diagnosed, otherwise healthy cats that have not previously been treated with insulin:
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- Bexagliflozin, given as a tablet once daily
- Velagliflozin, given as an oral solution once daily
For a caregiver who finds injections difficult, a daily pill or liquid can be a real advantage. It is not suitable for every cat, though. Cats that are vomiting, eating poorly, lethargic, dehydrated, or metabolically unstable may need insulin instead, and the veterinarian should screen for other health conditions and for ketosis before starting.
Ketone monitoring is central to this approach. The key test is blood beta-hydroxybutyrate (BHB). AAHA emphasizes close monitoring during the first two weeks, because diabetic ketoacidosis can develop even when blood glucose is not high. Contact the veterinary team promptly for appetite loss, vomiting, lethargy, or any worsening condition.
Oral therapy swaps the injection routine for a different monitoring routine. It is not automatically easier or safer overall.
Diet and weight management
Carbohydrate restriction can support glucose control in cats, and weight loss can reduce insulin resistance in overweight cats. A lower-carbohydrate, higher-protein diet is a common clinical approach, but the right diet depends on body condition, other diseases, food acceptance, and the treatment chosen. Weight loss should be gradual and supervised.
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Diet changes should be coordinated with the treatment plan. AAHA’s 2026 guidance advises cats starting an SGLT2 inhibitor to keep their usual food for the first two weeks. If the cat is doing well, a lower-carbohydrate diet can then be introduced gradually. Changing food during the same window as a new drug makes it harder to tell which change caused a problem.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Insulin or an oral SGLT2 inhibitor: how the options compare
The guidance does not identify a universal winner. The choice depends on the cat’s health, the household’s routine, and the monitoring the household can keep up with.
| Factor | Insulin | Oral SGLT2 inhibitor |
|---|---|---|
| Eligibility | Common traditional approach; may be needed for cats that are vomiting, eating poorly, lethargic, dehydrated, or metabolically unstable | Licensed in the United States for newly diagnosed, otherwise healthy cats not previously treated with insulin (AAHA 2026 guidance) |
| How it is given | Injection; the guideline’s typical starting reference is every 12 hours | Once daily, as a tablet (bexagliflozin) or oral solution (velagliflozin) |
| Main safety concern emphasized | Hypoglycemia (low blood glucose) | Ketosis and diabetic ketoacidosis, which can occur even when blood glucose is not high |
| Monitoring emphasized | Glucose trends and clinical signs, with dose changes made by the veterinarian | Blood beta-hydroxybutyrate (BHB) ketone checks, with close early monitoring especially in the first two weeks |
| Caregiver workload | Injections and matching the syringe to the insulin concentration | Daily oral dosing, ketone monitoring, and watching appetite and energy |
Monitoring at home
Home tracking gives the veterinary team a clearer picture than occasional clinic visits. Useful records include:
- Water intake and how often the cat urinates
- Body weight, recorded on the same scale at a consistent time
- Appetite and eating pattern
- Glucose readings, when the plan includes home glucose monitoring
- Ketone checks, when the treatment requires them
Home glucose monitoring can avoid some of the stress effects of clinic testing. A meter and technique suited to cats should be chosen with veterinary help. Any change in insulin dose or treatment should be made only under the veterinarian’s direction.
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Remission and long-term quality of life
Good quality of life is achievable with appropriate home care and regular veterinary follow-up. Remission, a period in which diabetes is controlled with less or no ongoing treatment, is possible, especially when glycemic control is established early and reversible insulin resistance is addressed. AAHA’s 2026 guideline states: “Diabetic remission is a reasonable goal in feline patients.” Remission is not a cure, and relapse can occur, so follow-up does not stop once a cat appears well.
How often and how soon remission happens
- About 30% is the approximate average remission rate in the United States reported in AAHA’s 2026 guideline. Rates vary by patient and management. This is a population figure and does not predict an individual cat’s outcome.
- About a quarter of cats that achieve remission do so within the 2 to 3 months after diagnosis, according to AAHA’s 2026 guideline.
- A majority of cats that achieve remission do so within six months, according to the same guideline.
Emergencies: low blood sugar and ketoacidosis
Both conditions can become life-threatening. Keep your veterinary clinic and an after-hours emergency clinic number where you can find them quickly.
Diabetic ketoacidosis
Diabetic ketoacidosis requires urgent veterinary care. Treat any of the warning signs described for SGLT2 inhibitors as a reason to call the veterinary team immediately rather than waiting to see whether the cat improves.
Severe hypoglycemia
Low blood glucose can cause weakness, lethargy, vomiting, poor coordination, tremors, or seizures. If you see these signs in a cat on diabetes treatment, act in this order:
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- Call your veterinarian or nearest emergency clinic at once.
- If the cat is awake and able to eat, offer its regular food.
- If the cat will not eat, oral glucose can be part of the emergency response, but follow the advice of the veterinary team you are speaking with.
- Do not put anything into the mouth of a convulsing or comatose cat, because of the risk of choking.
- Transport the cat promptly. Do not delay the trip to try home treatment.
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