Dogs and cats can both develop diabetes, but the disease is diagnosed, treated and monitored differently in each species. Increased thirst and urination, appetite changes, unexplained weight loss and low energy warrant a veterinary appointment; cats may also develop hindlimb weakness or a poor coat. A veterinarian must interpret blood and urine findings together with your pet’s signs—one high glucose reading, particularly in a stressed cat, is not enough to diagnose diabetes.
Once diabetes is confirmed, treatment usually involves a veterinary-directed plan for medication, food, weight management and glucose monitoring. Never change insulin or start a glucose-lowering drug from a home reading alone. Sudden vomiting, marked weakness, severe lethargy or refusal to eat can signal a life-threatening complication and needs prompt veterinary advice.
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What diabetes means in a pet
Diabetes mellitus occurs when glucose cannot move from the bloodstream into cells effectively because insulin is absent, insufficient or not working properly. Glucose then remains elevated in the blood and spills into urine, drawing water with it. That process helps explain the classic combination of excessive urination and thirst. Ongoing glucose loss can also lead to weight loss even when a pet is hungry.
The underlying disease is not managed identically in dogs and cats. The American Animal Hospital Association (AAHA) published separate canine and feline diabetes guidance in 2026 because each species has distinct disease patterns and treatment decisions. AAHA Chief Medical Officer Jessica Vogelsang, DVM, said on September 1, 2026: "We are especially excited to announce that, for the first time, we have divided these into separate Canine and Feline Guidelines in recognition of the unique nature of the disease process in each species."
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Signs that should prompt a veterinary visit
How can I tell if my dog has diabetes?
Common signs in dogs include drinking more than usual, producing larger or more frequent amounts of urine, changes in appetite, unexplained weight loss and lethargy. Early changes may be gradual, so noticing that the water bowl needs filling more often or that your dog is losing weight despite eating normally is useful information for the veterinarian.
These signs are not unique to diabetes. Kidney disease, urinary disorders, hormonal disease, medication effects and other illnesses can look similar. Keep a short record of drinking, urination, appetite, body weight and energy rather than trying to interpret one symptom in isolation.
What are the signs of diabetes in cats?
Cats may show increased thirst and urination, increased or altered appetite, weight loss and lethargy. Poor coat condition can develop, and hindlimb weakness is a particularly important feline clue. Affected cats may appear to walk with their hocks closer to the ground or have difficulty jumping, although other neurologic and orthopedic conditions can cause weakness too.
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When signs are an emergency
Diabetic ketoacidosis (DKA) is a serious complication in which the body produces ketones while it lacks usable insulin. A pet with known or suspected diabetes that is vomiting, acutely weak, very lethargic or not eating needs prompt veterinary advice. Call your veterinary hospital or an emergency clinic rather than waiting for a routine appointment. Do not try to correct the problem with extra insulin, food changes or human medication unless a veterinarian gives specific instructions.
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How veterinarians diagnose diabetes
Canine diagnosis
For a dog showing characteristic clinical signs, the 2026 AAHA canine guidance describes documenting glucosuria (glucose in urine) together with concurrent hyperglycemia (high blood glucose). Under the guideline’s ALIVE framework, a cited clinical criterion is blood glucose of at least 200 mg/dL accompanied by glucosuria and compatible signs.
The 200 mg/dL figure is a canine clinical criterion, not a home screening cutoff. A meter reading without a urine result and clinical context cannot establish diabetes. Your veterinary team may repeat measurements or investigate other illnesses when the findings do not fit the dog’s condition.
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Feline diagnosis
In cats, glucose can rise transiently because of stress. The feline guideline cites an approximate renal glucose threshold of 250–300 mg/dL—the blood concentration at which glucose may begin appearing in urine—but that threshold does not independently diagnose diabetes. A stressed cat can have an elevated blood result, and a urine sample must be interpreted alongside signs and other evaluation.
Tell the veterinarian what you have observed at home, including changes in water intake, litter-box output, appetite, weight, grooming and mobility. Bring a medication list and note whether the cat ate before the visit. The clinician will decide which blood and urine evaluations, and whether repeat or additional testing, are appropriate.
What happens at the first appointment
The veterinarian starts with a history and physical examination, then correlates blood glucose with urine glucose and the pet’s clinical picture. If results are discordant—for example, a high glucose value in a cat with no compatible signs—the team may seek confirming information instead of labeling the pet diabetic immediately. Conversely, a pet that is visibly ill may need urgent assessment for DKA or another condition before a long-term plan is chosen.
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Dog and cat diabetes: the practical differences
| Issue | Dogs | Cats |
|---|---|---|
| Interpreting glucose | AAHA cites blood glucose ≥200 mg/dL plus glucosuria and characteristic signs as a canine clinical criterion; this is not a home cutoff. | Stress hyperglycemia is common enough that one high reading is not diagnostic. The cited renal threshold is approximately 250–300 mg/dL, but it does not prove diabetes. |
| Core treatment options | Insulin therapy is central to canine management, with food and weight plans individualized by the veterinary team. | Guidance covers insulin and, for eligible newly diagnosed cats, SGLT2 inhibitor drugs. Selection depends on the individual cat and requires monitoring. |
| Monitoring | Clinical signs, body weight and glucose assessment are used together. Curves or a continuous glucose monitor may be needed when control is poor. | The same principles apply, with additional attention to appetite, mobility, coat and the possibility that control may change over time. |
| Remission | Do not assume diabetes will resolve; ongoing treatment and reassessment are expected. | Some cats achieve diabetic remission, but it is not guaranteed. Remission still requires veterinary follow-up because diabetes can recur. |
Treatment for diabetic dogs
Insulin is the foundation
AAHA canine guidance centers treatment on prescribed insulin. The veterinarian chooses an insulin product, delivery method, schedule and starting plan for the individual dog. Those decisions depend on the dog’s weight, health, eating pattern, glucose response and other illnesses. A general article cannot safely provide a dose or tell you how to alter one.
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Food and body condition
Dietary management is part of individualized diabetic care. There is no single food that is right for every dog with diabetes. Your veterinarian may set a feeding schedule and a weight target based on the dog’s current body condition, appetite and concurrent disease. Keep meals and treats consistent enough for the treatment plan to be interpreted, and report refusal to eat or rapid weight change promptly.
Treatment for diabetic cats
Insulin and SGLT2 inhibitors
Current feline guidance discusses both insulin and SGLT2 inhibitor drugs for eligible newly diagnosed cats. These are not interchangeable do-it-yourself options. The veterinarian must decide whether a cat is an appropriate candidate, explain expected benefits and risks, and arrange monitoring for the selected therapy. Never give a human diabetes medicine or use a leftover prescription.
Insulin remains an important feline treatment option, especially when a cat is clinically ill or the veterinarian believes rapid, dependable glucose control is needed. As with dogs, the dose and schedule are individualized and should not be changed because of one home reading.
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Diet, appetite and weight
Feline dietary plans vary with body condition, food preferences, kidney or gastrointestinal disease and the medication strategy. A cat that suddenly eats less is not simply being difficult: reduced intake can make a prescribed plan unsafe and may indicate DKA or another illness. Contact the veterinary team for instructions rather than forcing a major diet change or skipping medication on your own.
Can a diabetic cat go into remission?
Yes, some cats achieve diabetic remission, meaning they can maintain acceptable glucose control without ongoing medication for a period of time. Remission is not guaranteed, and it does not mean the disease can be ignored. A cat in remission still needs scheduled examinations and instructions about watching for renewed thirst, urination, weight loss or appetite changes. If signs return, arrange a recheck promptly.
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Track more than a glucose number
AAHA monitoring guidance includes clinical signs and body weight as well as glucose assessment. Record daily water intake when practical, urination changes, appetite, energy, vomiting, body weight at the interval your veterinarian recommends and every medication dose. A simple dated log helps the team see trends and identify a problem that a single reading would miss.
Blood glucose curves and continuous monitoring
When diabetes is uncontrolled, a veterinarian may recommend a blood glucose curve or a continuous glucose monitor (CGM). A curve shows how glucose changes over a defined period after treatment; a CGM provides repeated readings through a sensor. The clinic will explain how often to measure, how to record results and which patterns require a call.
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A veterinary-calibrated portable blood glucose meter can support home monitoring. Ask your veterinary team to select a device, confirm its calibration and compatible strips, and demonstrate sampling technique. Human meters and strips may not perform the same way in animal blood, so do not assume a device is suitable because it is convenient or inexpensive.
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Why one spot check must not drive an insulin increase
AAHA specifically cautions that isolated glucose spot checks should not be the sole reason to increase a dog’s insulin. Readings can be affected by timing, food, sampling problems, meter limitations and the normal daily pattern. Low or unexpected results need veterinary interpretation. Send the log and meter information to the clinic and wait for instructions instead of making an unsupervised adjustment.
Recognizing and preventing hypoglycemia
Hypoglycemia means blood glucose is too low. It can occur when medication and food intake do not match, when an animal is ill or when treatment is changed without adequate monitoring. Because severe hypoglycemia can be dangerous, the safest plan is one written specifically for your pet: ask what reading, behavior or missed meal should trigger a call, which emergency number to use and what immediate steps are appropriate.
If your pet has a low or unexpected reading, is suddenly weak, unusually lethargic, uncoordinated, unresponsive or unable to eat, contact a veterinarian urgently. Do not administer an extra dose to correct a high result, and do not delay care while repeatedly testing. Keep the prescribed medication, meter, strips and written emergency instructions together so another caregiver can act correctly.
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Building a safe long-term care routine
- Confirm the diagnosis and species-specific plan. Ask how the blood and urine findings support diabetes, what other illnesses were considered and which signs should prompt an earlier recheck.
- Standardize the daily routine. Give medication exactly as prescribed, follow the agreed feeding schedule and record doses, appetite, water intake, urination, weight and notable behavior.
- Learn the equipment. Have the clinic demonstrate the meter or CGM, sampling, strip storage, sensor care and disposal of sharps. Verify that syringes or pen needles match the prescribed insulin.
- Schedule reassessments. Bring the log and equipment to follow-up visits. The veterinarian may use a curve, CGM data, body weight and clinical signs to decide whether the plan is working.
- Prepare for disruptions. Before travel, boarding, surgery or a change in food, obtain written instructions. Ask in advance what to do if your pet vomits, refuses a meal, loses weight or a dose is missed.
When to call the veterinarian
- Thirst, urination, appetite or weight changes are increasing or returning.
- Your pet refuses food, vomits, becomes markedly lethargic or weak, or develops new hindlimb weakness.
- A glucose result is unexpectedly low or does not fit how your pet looks.
- You are unsure whether a dose was given, used the wrong supply or cannot keep medication down.
- You are considering a new diet, supplement, human medicine or a change in insulin or other diabetes drug.
Diabetes can be managed, but it is a condition that requires an ongoing partnership with a veterinary team. Dogs generally rely on carefully monitored insulin therapy, while cats may receive insulin or an appropriate SGLT2 inhibitor and may, but do not always, enter remission. Accurate diagnosis, consistent records and rapid attention to illness or low glucose are the safeguards that make treatment safer.
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