Why is my dog drinking so much water and peeing sticky urine?
Drinking a lot more means that he is also urinating a lot more. This is called Polydipsia and polyuria or PU PD.
There are various reasons for PU PD and they need to be investigated by a veterinarian, especially in an old dog.
Blood work can rule out any of those.
1) diabetes---a urinalysis and blood test will be able to rule it in or out. Diabetes is usually treated with diet and insulin.
2) Cushing's disease: This is an overproduction of cortisone, either signaled by a pituitary tumor in the brain or by a malfunction or tumor of the adrenal glands. Medication can inhibit cortisone production. A potbelly and thinning or haircoat and excessive panting are common signs as well.
3) Kidney disease, treated with diet and supportive treatment
4) A urinary tract infection, urinary crystals or stones: treatment varies according to the cause.
5) diabetes insipidus, usually tested with a water deprivation test and treated with a medication called Minirin.
You will need to make an appointment with your vet for an exam and blood tests. I am sure your vet will find the cause of the PU PD.
Updated on September 23rd, 2025