Hot days and long walks raise needs sharply, offer water every 15–20 minutes on warm outings. Wet food carries ~70% water, so those dogs visibly drink less. That's normal.
How much water does a dog need?
A healthy adult dog drinks roughly 50 to 60 ml of water per kilogram of body weight per day, so an 8 kg dog lands around 400 to 480 ml and a 30 kg dog around 1.5 to 1.8 litres. That is a baseline, not a target: the number climbs with heat, exercise, dry food and lactation, and it drops when a dog eats wet or fresh food, which is about 70 percent water already.
The calculator above uses your dog's weight and diet to give a range rather than a single figure, because dogs self-regulate well when water is always available. What matters is the trend. A dog that suddenly drinks far more than usual, or far less, is telling you something: diabetes, kidney trouble and urinary infections all show up as thirst first. Puppies and seniors sit at the higher end of the range.
Practical rule: fresh water in two places at home, a bowl in the car, and on warm outings offer water every 15 to 20 minutes. If the gums feel tacky or the skin at the scruff is slow to fall back when gently lifted, your dog is already behind.
Common questions
How much water should a dog drink per day?
About 50 to 60 ml per kilogram of body weight, so a 10 kg dog needs roughly half a litre. Heat, exercise and dry food push the number up; wet food brings it down.
Is my dog drinking too much?
A sustained jump above about 100 ml per kilogram per day is worth a vet visit. Excess thirst is an early sign of diabetes, kidney disease and Cushing's, and easy to rule out with a blood test.
Should I limit water at night?
No. Restricting water does not fix house training and can cause dehydration. Fix the schedule instead: a last toilet break right before bed and a consistent morning routine.
