Q. Well controlled Elderly diabetic cat excessive drinking last 3 months. Kidney function, fructosamine and glucose curve all tested and good.
A. Rule out UTI or hyperthyroidism as well. Even a 'regulated' diabetic cat may exhibit excessive thirst at times. If you feed dry food, try switching to a good quality canned diet. Canned foods have a significantly higher moisture content and are better, especially for the diabetic patient.
DAVID ELBEZE, DVM, MRCVS
A. Have her tested for Hyperthyroidism, this condition is very common in older cats and can either mask or be masked by kidney failure. If the Thyroxin level is in normal range but on the upper side, continue with the "free T4" test as well which is more reliable.
Hypethyroidism, among other symptoms, can cause excessive drinking.