Diabetes, pyometra, diabetes insipidus, renal failure, cholecystitis, liver disease, hyperthyroidism and other diseases may cause dogs to drink water and urinate all the time. Dogs can be tested for urine sugar, blood sugar and fructosamine to see if they really have diabetes.

There may also be endocrine disorders in dogs, such as increased levels of adrenocortical hormones, also known as Cushing's syndrome, which may also cause polydipsia and polyuria in dogs. Adrenocortical hormone levels can be tested. It is also possible that the dog has serious kidney disease and may have similar symptoms.

When a dog's daily diet contains a lot of salt, the dog will drink a lot of water if it feels dry, and excrete the salt from the body through urination. In this regard, it is recommended that owners adjust their dogs' diet in a timely manner and try not to feed foods with high salt content.