Feline diabetes mellitus — primarily type 2, analogous to human type 2 diabetes — is increasingly common in domestic cats, with prevalence estimated at 1 in 230 cats in the UK and similar rates in other developed countries. It is a manageable condition, but management requires commitment and has significant welfare implications for both the cat and owner.
Uncontrolled diabetes causes significant welfare compromise. Hyperglycemia leads to polyuria (excessive urination), polydipsia (excessive thirst), polyphagia (increased appetite), and weight loss. Glucose toxicity to peripheral nerves causes diabetic neuropathy — affected cats develop plantigrade stance (walking on hocks), which is painful and impairs mobility. Diabetic ketoacidosis (DKA) — a life-threatening complication — causes severe metabolic derangement and requires emergency treatment.
Diagnosis requires persistent hyperglycemia (above stress-induced transient hyperglycemia) and glucosuria (glucose in urine). Fructosamine measurement reflects blood glucose over the preceding 2-3 weeks, helping distinguish stress hyperglycemia from true diabetes. Early diagnosis allows management before complications develop — owner awareness of signs (increased thirst, urination, weight loss) enables earlier veterinary consultation.
Twice-daily insulin injection is the mainstay of feline diabetes management. The welfare implications of injection management are complex: many cats tolerate insulin injections well, particularly when administered calmly and with positive association training. However, the twice-daily commitment requires reliable owner presence and can cause welfare compromise when routine is disrupted.
Glargine insulin (Lantus) or ProZinc (protamine zinc insulin) achieves diabetic remission in 30-50% of newly diagnosed cats when combined with low-carbohydrate diet — a welfare-significant outcome eliminating the need for ongoing insulin therapy.
Low-carbohydrate, high-protein diets significantly improve glycemic control in diabetic cats and improve remission rates. Canned/wet foods are generally lower in carbohydrates than dry foods. Diet transition should be gradual to maintain food acceptance — a diabetic cat that refuses to eat faces hypoglycemia risk if insulin is given.
Hypoglycemia — low blood glucose from excessive insulin dosing — is the most immediately dangerous complication of diabetes management, causing weakness, disorientation, seizures, and death. Owner education on hypoglycemia recognition and treatment (glucose syrup application to gums) is an essential welfare safety measure.
Well-controlled diabetic cats can have excellent quality of life — often comparable to non-diabetic cats of the same age. Regular glucose curve monitoring, veterinary check-ups, and owner vigilance maintain quality of life. The welfare imperative is achieving diabetic control without overcorrection causing hypoglycemia, and with monitoring sufficient to detect remission when it occurs.