Dog Care
How Much Water Should a Dog Drink a Day? (Chart by Weight)
Quick answer: Most healthy dogs drink about 40–60 ml of water per kilogram of body weight per day — roughly 0.6–0.9 fluid ounces per pound. A 20 kg (44 lb) dog, for example, typically drinks around 0.8–1.2 liters (27–41 fl oz). Needs rise with heat, exercise and dry food. Drinking more than about 100 ml/kg (about 1.5 fl oz per lb) a day, or a clear change from your dog’s normal, is a reason to see your veterinarian.
Water is the simplest thing you give your dog every day — and one of the most useful health signals you have. Here’s what’s normal and what isn’t.
Dog water intake chart
| Dog’s weight | Typical daily water (40–60 ml/kg) | Worth checking with a vet if consistently over (100 ml/kg) |
|---|---|---|
| 5 kg (11 lb) | 200–300 ml (6.8–10 fl oz) | 500 ml (17 fl oz) |
| 10 kg (22 lb) | 400–600 ml (13.5–20 fl oz) | 1 L (34 fl oz) |
| 20 kg (44 lb) | 0.8–1.2 L (27–41 fl oz) | 2 L (68 fl oz) |
| 30 kg (66 lb) | 1.2–1.8 L (41–61 fl oz) | 3 L (101 fl oz) |
| 40 kg (88 lb) | 1.6–2.4 L (54–81 fl oz) | 4 L (135 fl oz) |
Based on figures reported by the American Kennel Club, including the guidance from Brian Collins, DVM, of Cornell University College of Veterinary Medicine, that excessive thirst (polydipsia) is generally considered more than 100 ml/kg per day. These are guides, not targets — don’t force a dog to drink.
What about the “1 ounce per pound” rule?
You’ll often see “about one ounce of water per pound of body weight” quoted online. It’s a rough rule of thumb that sits a little above the 40–60 ml/kg range. Either way, the most useful number is your dog’s own normal.
What changes how much a dog drinks?
- Heat and humidity — dogs cool themselves by panting, which uses water.
- Exercise — walks, hikes, play and swimming.
- Diet — dogs on dry kibble drink more than dogs eating wet or fresh food, which contains water.
- Age — puppies and seniors can have different needs; check with your vet.
- Pregnancy and nursing.
- Medication — some medicines increase thirst. Ask your vet what to expect.
- Salty treats or chews.
How to measure your dog’s water intake
- Fill the bowl with a measured amount in the morning (use a measuring jug).
- Top up with measured amounts through the day and note them.
- Measure what’s left after 24 hours and subtract.
- Repeat for 2–3 normal days to find your dog’s baseline.
If you have several pets sharing a bowl, give the dog you’re measuring their own bowl for those days.
Signs your dog is drinking too much
The AKC lists signs such as needing to refill the bowl more often, drinking from unusual places (puddles, toilets), urinating more often or for longer, asking to go out more, and accidents indoors.
Why it matters: According to the AKC, the three most common causes of excessive thirst in dogs are diabetes mellitus, Cushing’s disease and chronic kidney disease, with other causes including liver disease, urinary tract infections, high calcium and pyometra (a uterine infection in unspayed females). Only your veterinarian can find the cause — usually with a check-up and simple urine and blood tests.
Don’t restrict water to stop a dog drinking a lot. Book a vet visit instead. An unspayed female who is drinking a lot and seems unwell, or any dog who is vomiting, lethargic or not eating, should be seen promptly.
Signs your dog isn’t drinking enough
- Dry, sticky gums
- Lethargy or weakness
- Sunken-looking eyes
- Dark yellow urine, or urinating much less
- Skin that is slow to settle back after a gentle lift (a rough check only)
A dog who refuses water, or shows signs of dehydration — especially with vomiting or diarrhea — should be checked by a vet the same day.
How to help your dog drink enough
- Keep fresh, clean water available at all times, in more than one spot.
- Wash bowls daily.
- Carry water and a travel bowl on walks, hikes and car trips (see our hiking with dogs checklist).
- Try a wider bowl, a pet fountain, or adding water to food — ask your vet before changing diets.
- Offer water after exercise in small, regular amounts rather than one huge gulp.
FAQ
How much water should a puppy drink?
Puppies need regular access to fresh water and often drink in small, frequent amounts. Because needs vary by age, size and diet, ask your vet for guidance during early check-ups.
Should I leave water out for my dog all day?
Generally yes. Some owners lift water an hour or two before bed during house training — discuss this with your vet first.
Why is my dog drinking so much water all of a sudden?
Hot weather or extra exercise can explain a short-term increase. If it continues for more than a day or two without an obvious reason, see your vet.
Can a dog drink too much water at once?
Yes. Very large amounts swallowed quickly — for example during long sessions of swimming or playing with hoses — can be dangerous. Take breaks during water play, and contact a vet urgently if your dog becomes wobbly, vomits or seems unwell after swimming.
Related reading
Sources
- American Kennel Club — Why Is My Dog Drinking So Much Water?
- American Kennel Club — Is Your Puppy Drinking Enough Water?
- PDSA — Exercise for dogs (hot-weather advice)
This article is general information, not veterinary advice. Your veterinarian can tell you what’s right for your dog.
