An older dog who suddenly drinks and pees much more needs a vet check. Learn how much water is normal, the most common medical causes in senior dogs, and how to measure intake at home before your appointment.
If your senior dog is suddenly drinking much more water than usual, book a vet visit rather than limiting the water bowl. Healthy dogs typically drink about 40 to 60 ml per kilogram of body weight a day, and more than 100 ml per kilogram is generally considered excessive, according to the American Kennel Club. In older dogs, increased thirst is often an early sign of kidney disease, diabetes or Cushing's disease, all of which are easier to manage when caught early.
How much water is normal?
A rough guide from the AKC figures above:
A 10 lb (4.5 kg) dog: about 6 to 9 fl oz a day. More than about 15 fl oz is a lot.
A 30 lb (13.6 kg) dog: about 18 to 28 fl oz a day. More than about 46 fl oz is a lot.
A 60 lb (27 kg) dog: about 37 to 55 fl oz a day. More than about 91 fl oz is a lot.
Hot weather, exercise, dry food and some medicines raise intake, so the most important sign is a change from your own dog's normal.
Common causes in older dogs
1. Chronic kidney disease: aging kidneys lose the ability to concentrate urine, so the dog drinks more to keep up.
2. Diabetes mellitus: often comes with weight loss despite a good appetite.
3. Cushing's disease (hyperadrenocorticism): often with a pot-bellied look, thinning coat and heavy panting.
4. Liver disease or high blood calcium.
5. Urinary tract infection.
6. Pyometra, a uterine infection in unspayed females. This is an emergency.
7. Medications such as steroids or diuretics.
Signs that often come with it
The water bowl needs refilling more often, your dog asks to go out more, has accidents indoors, drinks from toilets or puddles, or passes large amounts of pale urine.
How to measure intake at home
1. Use one bowl only and pick up other water sources for a day.
2. Fill the bowl with a measured amount in the morning using a measuring cup.
3. Top it up with measured amounts and note each one.
4. The next morning, measure what is left and subtract.
5. Repeat for two or three days and bring the numbers to your vet.
Never restrict water unless your vet tells you to. A dog with kidney disease or diabetes can become dehydrated quickly.
What your vet may check
Expect a physical exam, blood work and a urinalysis, which measures how concentrated the urine is. Depending on the results, your vet may suggest further hormone tests or imaging. VCA Animal Hospitals explains that urine concentration and blood tests together help narrow down the cause.
Call your vet today if
Increased thirst comes with vomiting, not eating, lethargy, a swollen belly, vaginal discharge in an unspayed female, or if your dog seems weak or collapses.
Related guides
Senior dog losing weight but still eating: /blog/senior-dog-losing-weight-still-eating
Chronic kidney disease in aging dogs: /blog/chronic-kidney-disease-aging-dogs
Managing canine diabetes in senior dogs: /blog/managing-canine-diabetes-senior-dogs
Frequently asked questions
Is it normal for old dogs to drink more water? A small change with hot weather or more activity can be normal, but a clear, lasting increase is not a normal part of aging and should be checked.
Should I take the water away at night? No, not without your vet's advice. Limiting water can be dangerous for dogs with kidney disease or diabetes.
Can dry food make my dog drink more? Yes. Dogs on dry kibble drink more than dogs on wet food, which is why a change from your dog's usual pattern matters more than the number alone.
Sources: American Kennel Club, "Why Is My Dog Drinking So Much Water?" (https://www.akc.org/expert-advice/health/why-is-my-dog-drinking-so-much-water/); VCA Animal Hospitals, "Testing for Increased Thirst and Urination" (https://vcahospitals.com/know-your-pet/testing-for-increased-thirst-and-urination).
This guide is educational and does not replace your veterinarian. SILVERPAW earns from qualifying Amazon purchases at no extra cost to you.
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