what causes excessive thirst in older dogs
Symptoms of Polydipsia and Polyuria in Dogs. The most common symptoms of these medical conditions are an increase in urination, and drinking much more water than usual. There are generally no other behavioral changes. Causes of Increased Thirst and Urination in Dogs. The primary causes of polydipsia and polyuria include congenital abnormalities, and those associated with renal failure. Congenital diseases can include diabetes, a decrease in steroid production by the adrenal glands, and some rare psychological disorders.