Senior Dog Fit

How Much Water Should a Dog Drink a Day?

A healthy dog drinks roughly 40-60 mL per kg of body weight a day — for a 10 kg (22 lb) dog, that's about 400-600 mL (13-20 oz). Drinking more than 100 mL/kg/day is the threshold vets use to flag polydipsia, which can be a sign of kidney disease, diabetes, or other conditions. Enter your dog's weight below.

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If you know your dog's daily kcal, water need can also be estimated at 1 mL per kcal — a second, independent check on the range above. Get this number from the calorie calculator.

Measure by filling the bowl to a known amount and checking what's left after 24 hours. If you enter this, we'll flag whether it's over the polydipsia threshold.

Where these numbers come from

40-60 mL/kg/day and the 1 mL/kcal equivalence are from the National Research Council's Nutrient Requirements of Dogs and Cats (2006). The >100 mL/kg/day polydipsia threshold is from Polzin (2011), Journal of Veterinary Emergency and Critical Care, checked 2026-08-15. Water need rises with heat, exercise, and dry-food-only diets, and drops on wet food — these are ranges, not fixed targets. A single high reading isn't a diagnosis; a sustained pattern above the threshold is what's worth a vet visit.

Tools for measuring intake

A dispenser with a marked reservoir makes it easy to fill to a known amount and check what's left after 24 hours, the method described above.

Gravity water dispenser (128 oz) on Amazon