How much water should a dog drink a day?
Updated October 5, 2026 by Kamal Nasir
A common rule of thumb from the American Kennel Club (AKC) and PetMD is about 1 ounce of water per pound of body weight a day, roughly 65 ml per kilogram. So a 10 pound dog drinks around 10 ounces and a 50 pound dog around 50 ounces. It is a baseline, not a target: food, heat, exercise and age all move it, and a lasting change in how much your dog drinks is a reason to call your vet.
General information, not medical advice. How these guides are made.
Daily water by weight
Using the 1 ounce per pound rule, these are rough daily amounts. Metric figures are rounded conversions.
- 10 lb (about 4.5 kg): about 10 oz, roughly 300 ml
- 20 lb (about 9 kg): about 20 oz, roughly 600 ml
- 40 lb (about 18 kg): about 40 oz, roughly 1.2 liters
- 60 lb (about 27 kg): about 60 oz, roughly 1.8 liters
- 90 lb (about 41 kg): about 90 oz, roughly 2.7 liters
Normal varies more than the rule suggests
Measured intake is often lower than the rule of thumb. Cornell University's Riney Canine Health Center says healthy dogs drink about 0.6 to 0.9 ounce of water per pound a day (40 to 60 ml per kilogram), so a 20 pound Beagle drinks about 1.5 to 2.25 cups (360 to 540 ml). The AKC gives the same range and says intake naturally varies from day to day with weather, activity and diet. A healthy dog can drink well below the rule of thumb, especially on wet food, so your own dog's usual amount is the number that matters most.
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What changes how much a dog drinks
PetMD advises against restricting a dog's water and says there is no need to measure every drop unless your vet asks. Keep fresh, clean water available all day.
- Food: PetMD notes that canned and homemade diets are about 65 to 80 percent water, so dogs on wet food often drink less than dogs on dry kibble.
- Heat and exercise: the AKC says dogs may need more water on hot days and with more activity.
- Age: the AKC says weaned puppies generally need between half an ounce and an ounce per pound a day, and young puppies being weaned need about half a cup every two hours.
- Illness: the AKC lists vomiting, fever, diarrhea and excessive urination as possible causes of dehydration.
How much is too much?
A Cornell University veterinarian quoted by the AKC says excessive drinking, called polydipsia, is generally considered when a dog drinks more than about 1.5 ounces per pound of body weight a day (100 ml per kilogram). A smaller rise can still matter if it is a clear change from your dog's normal. Signs include refilling the bowl more often and more requests to go outside.
Increased drinking can be an early sign of conditions such as kidney problems, diabetes or Cushing's disease, so the AKC and PetMD both say to tell your vet. The AKC also warns never to try a water deprivation test at home and never to restrict water unless your vet advises it.
Signs your dog is not drinking enough
The AKC's chief veterinarian says a dog with signs of dehydration, persistent vomiting or suspected heatstroke should see a vet immediately, as this is a medical emergency.
- Skin that is slow to spring back after you gently lift it near the shoulder blades
- Dry or sticky gums, or gums that take longer than about two seconds to turn pink again after a gentle press
- Sunken, dry-looking eyes
- Low energy or lethargy
Keeping track of a dog's water
Because a change from your dog's baseline matters more than any single number, a simple daily record of bowls filled makes a change easier to spot and to describe to your vet.
HydroNest Family Water Tracker has pet profiles for a dog, cat or other companion. It sets a daily water goal from the pet's weight, based on common veterinary guidance, and logs a bowl with one tap on the same family dashboard as the rest of the household. Only pet-safe drinks are offered. Pet profiles are part of HydroNest Premium, and the goal is guidance only: your vet's advice comes first.
Questions people ask
How much water should a 50 pound dog drink a day?
About 50 ounces, a little over 6 cups or roughly 1.5 liters, using the 1 ounce per pound rule from the AKC and PetMD. A dog on wet food may drink less, and hot days or exercise raise it.
Is it normal for my dog to drink a lot after exercise?
Usually, yes. The AKC says thirst after a hike on a warm day is not typically a medical concern, and that the pattern is what matters. If your dog regularly drinks much more than usual, see your vet.
Should I take my dog's water away at night?
For puppies being house-trained, the AKC suggests removing food and water about two to three hours before bedtime. For adult dogs, PetMD advises against restricting water unless your vet tells you to.
Related
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- Best water tracking apps for iPhone in 2026
- HydroNest Family Water Tracker
Sources
- https://www.akc.org/expert-advice/health/puppy-drinking-enough-water/
- https://www.akc.org/expert-advice/health/warning-signs-dehydration-dogs/
- https://www.akc.org/expert-advice/health/why-is-my-dog-drinking-so-much-water/
- https://www.petmd.com/dog/nutrition/evr_dg_the_importance_of_water
- https://riney.vet.cornell.edu/member-benefits-health-tips/polyuria-polydipsia-april-2024