How Much Water Does a Dog Need Per Day? (Weight Table Inside)
Affiliate disclosure: this page contains affiliate links — if you buy through them, we may earn a commission at no extra cost to you.
The short answer: a healthy dog needs roughly 50–60 ml of water per kg of body weight per day — about one cup for every 4–5 kg. Heat, exercise and dry-food diets push the number up. The table below does the math per size class, and the section after it covers the part that matters more than any number: sudden changes in drinking are the signal worth watching.
The daily water table by dog size
| Dog size | Weight | Daily water (approx.) | In cups |
|---|---|---|---|
| Toy (Chihuahua) | 2–5 kg | 100–300 ml | ½–1¼ cups |
| Small (Beagle) | 5–10 kg | 250–600 ml | 1–2½ cups |
| Medium (Border Collie) | 10–25 kg | 500 ml–1.5 L | 2–6 cups |
| Large (Labrador) | 25–40 kg | 1.2–2.4 L | 5–10 cups |
| Giant (Great Dane) | 40–70 kg | 2–4+ L | 8–17 cups |
Multipliers that push the top of each range: hot weather (up to +50%), real exercise days, nursing, and dry kibble diets — wet food is ~70% water, kibble ~10%, so kibble-fed dogs drink visibly more by design. Puppies also drink more per kg than adults. None of this needs precision; it needs a full bowl and a rough sense of what normal looks like for your dog.
Too little, too much: when it's a vet call
Too little shows up as lethargy, dry gums and skin that stays tented when gently pinched — worth a same-day vet call, especially in summer (heatstroke and dehydration travel together). Too much is the quieter red flag: a dog that suddenly empties bowls it used to ignore, for days, without a heat or exercise explanation, is showing a classic early sign of kidney issues or diabetes. The keyword in both directions is sudden change from their baseline — which is exactly why knowing the rough normal from the table is useful.
Getting a reluctant drinker to drink
The cheapest effective tricks, in the order owners report them working: a fountain (moving water reads as fresher to many dogs — the same instinct as cats), multiple bowls on multiple floors, water mixed into kibble, and ice cubes as treats in summer. For walks and car days, a travel bottle with a lick trough means hydration doesn't wait for home.
Automatic Pet Water Fountain
Cats drink more from running water — filtered, quiet, and the centerpiece of a million cat videos.
🚚 Free shipping on most orders · price at time of writing
FAQ
How much water should a dog drink per day?
Roughly 50–60 ml per kg of body weight daily — a 10 kg dog needs around half a litre, a 30 kg dog around 1.5–1.8 litres. Heat, exercise and dry-food diets raise it further.
Why is my dog suddenly drinking so much water?
If heat, exercise or a switch to dry food doesn't explain it, sustained excessive drinking is a classic early sign of kidney issues or diabetes — book a vet visit rather than waiting it out.
Is it OK to give dogs ice water in summer?
Yes — the old claim that ice water causes bloat is a debunked myth. Cool water and ice cubes are fine and help with heat; what matters is constant access and shade.
→ See all Home, Plants & Pets picks