Dog Health • Endocrine

Diabetes in dogs: what should owners know?

Diabetes mellitus commonly causes increased thirst and urination, increased appetite with weight loss, and eventually weakness or cataracts. Most affected dogs require lifelong insulin therapy.

Veterinarian reviewedUpdated Aug 20, 2026
The key takeaway

Successful diabetic care depends on consistent insulin use, feeding routine, monitoring, and adjustment based on veterinary follow-up—not on a single glucose reading.

Common signs

  • Drinking and urinating more
  • Weight loss despite a normal or increased appetite
  • Reduced energy
  • Cataracts or vision change
  • Recurrent infections

How diabetes is diagnosed

Persistent hyperglycemia together with glucose in the urine and compatible clinical signs supports the diagnosis. Your veterinarian may also look for urinary infection, pancreatitis, endocrine disease, or other conditions that can affect diabetic control.

Daily management

Most diabetic dogs need insulin injections at consistent times, a stable feeding plan, appropriate body-weight management, and regular monitoring. Home glucose curves or continuous glucose monitoring may be used in selected cases. Insulin doses should never be changed casually without veterinary guidance.

When is it an emergency?

Vomiting, refusal to eat, profound weakness, dehydration, rapid breathing, collapse, or altered consciousness can signal diabetic ketoacidosis or another serious complication. Trembling, disorientation, seizures, or sudden weakness after insulin may indicate hypoglycemia and also require urgent guidance.