Dog Water Intake Calculator – How Much Water Should My Dog Drink?
A quick check on whether your dog's drinking is normal, and what a change in thirst can mean.
Expected daily water
1–1.2 litres
That is 1000–1200 ml a day for Your dog. Expect more in hot weather, after exercise, or if they eat dry food.
Ring your vet if they regularly drink more than 2 litres (2000 ml) a day.
See a vet if your dog
- Suddenly drinks far more or far less than usual
- Is asking to go out to wee much more often, or has accidents indoors
- Has tacky gums or skin that stays tented when lifted
- Is vomiting, has diarrhoea or is refusing food
- Is an unneutered female drinking heavily after a season – this can be a womb infection and is urgent
What is normal?
A healthy dog drinks somewhere around 50 to 60 millilitres of water per kilogram of body weight each day. For a 10 kg cocker spaniel that is roughly half a litre; for a 35 kg labrador it is nearer two litres. The figure moves about naturally: hot days, long walks, salty treats and dry food all push it up, while a dog eating wet food may drink barely anything from the bowl because the food is already three-quarters water.
How to measure it properly
Guessing is unreliable, so measure. Fill every bowl in the house using a measuring jug and note the total. Top up with measured amounts through the day. After 24 hours, pour what is left back into the jug and subtract. Repeat for three days and average the results, allowing for water drunk on walks. Take that number to your vet if you are worried – it is genuinely useful information.
Worked example: a 20 kg dog
Twenty kilograms multiplied by 50 ml gives one litre, and by 60 ml gives 1.2 litres. So a normal day is about a litre to a litre and a quarter. If the same dog is steadily getting through two litres a day, that is 100 ml per kg and warrants a vet appointment even if they seem well in themselves.
Drinking too much
Vets call it polydipsia, and it is one of the most useful early warning signs an owner can spot. The common causes are kidney disease, diabetes, Cushing's disease, an infected womb (pyometra – an emergency in unneutered females), liver problems and certain medicines such as steroids. Most of these are far easier to manage when caught early, so it is well worth the appointment.
Drinking too little
A dog who stops drinking is usually a dog who feels unwell. Check for dehydration by lifting the skin over the shoulders – it should spring straight back – and by feeling the gums, which should be moist rather than tacky. Dogs that are vomiting, have diarrhoea or are refusing food dehydrate quickly, and puppies and small dogs fastest of all. Never restrict water to control accidents in the house without your vet telling you to.
Encouraging a fussy drinker
- Offer several bowls around the house, away from the food.
- Try a wide ceramic bowl or a pet water fountain.
- Add a splash of water or low-salt, onion-free broth to meals.
- Carry water on walks and in the car, especially in summer.
- Change the water at least twice a day – dogs are fussier than we credit.
Frequently asked questions
How much water should a dog drink a day?
Roughly 50–60 ml per kilogram of body weight. A 20 kg dog therefore drinks about one to one and a quarter litres a day, more in hot weather or after exercise.
How do I measure what my dog drinks?
Fill the bowl with a measured jug, top it up with measured amounts, and measure what is left after 24 hours. Do this over three days and take an average, counting every bowl in the house.
When is drinking too much a problem?
Consistently drinking more than about 100 ml per kg a day needs a vet appointment. Increased thirst is an early sign of kidney disease, diabetes, Cushing's disease, womb infection and some medications.
My dog has suddenly stopped drinking. What should I do?
Ring your vet the same day, especially if they are also off their food, vomiting or lethargic. Dogs can dehydrate quickly.
Does wet food change how much they drink?
Yes, a lot. Wet food is around 75–80 per cent water, so dogs on wet food often drink noticeably less from the bowl. That is completely normal.
How do I check for dehydration?
Gently lift the skin between the shoulder blades – it should spring straight back. Tacky, dry gums are another sign. If either seems off, ring your vet.
Should I limit water for a dog that wees indoors?
No. Never restrict water without veterinary instruction. Frequent accidents plus heavy drinking is a reason to see the vet, not to take the bowl away.
Estimates only – not a substitute for advice from your vet.
Last reviewed: 22 September 2026