Is my pet drinking a normal amount?
Compare how much your dog or cat drinks with published veterinary ranges. Measure the water for 1–3 days, then enter the total.
Enter your pet's weight to see their typical range, then the water you measured.
Call a vet now if your pet:
has stopped drinking and eating, is vomiting repeatedly, collapses or is very weak — or is a male cat straining in the litter tray and passing little or no urine.
How to measure your pet's drinking
- Fill each water bowl with a measured amount (a measuring jug works well) and note the time.
- After 24 hours, measure what's left and subtract it. Add up every bowl, including any fountain.
- Leave a matching bowl somewhere your pet can't reach and subtract what evaporates from it.
- Repeat for 2–3 days and enter the total with the number of days; drinking varies from day to day.
- If pets share bowls, separate them for the measuring period only if it doesn't cause stress.
Typical drinking at a glance
| Pet | Typical drinking | Example | Increased drinking |
|---|---|---|---|
| Dog | 20–70 ml/kg/day | 10 kg dog: 200–700 ml | Over 100 ml/kg/day |
| Cat | Up to about 45 ml/kg/day | 4 kg cat: up to 180 ml | Over 100 ml/kg/day |
Ranges are guides from veterinary references, not exact limits. Food moisture, weather, exercise, age and medicines all change how much a pet drinks; a lasting change from your own pet's normal is often the most useful sign.
Common questions
How much water should a dog drink a day?
Most healthy dogs drink about 20–70 ml per kg of body weight a day, so a 10 kg dog typically drinks 200–700 ml. Dogs on dry food, in hot weather or after exercise drink towards the top of that range. Drinking more than 100 ml per kg a day is what vets call increased drinking and is worth a vet check.
How much water should a cat drink a day?
Cats usually drink up to about 45 ml per kg a day, so a 4 kg cat drinks up to roughly 180 ml. Cats eating mostly wet food get much of their water from food and may hardly drink at all. A cat drinking more than 100 ml per kg a day is drinking more than normal and should see a vet.
Why is my pet suddenly drinking a lot more water?
Hot weather, exercise, a switch to dry food, or losing fluid through vomiting or diarrhoea can all increase drinking. Persistent increased thirst can also be an early sign of kidney disease, diabetes, an overactive thyroid in cats, hormonal disease in dogs or a womb infection in unspayed females, so a lasting change needs a vet check.
Should I limit my pet's water if they drink too much?
No. Increased drinking is usually the body compensating for losing water, so restricting it can cause dangerous dehydration. Keep fresh water available at all times, measure how much is drunk, and take the numbers to your vet.
How do I measure how much my pet drinks?
Fill the bowl with a measured amount, measure what is left 24 hours later and subtract. Repeat for 2–3 days and use the total, because daily drinking varies. Keep a second bowl out of reach to check evaporation, and separate pets for the measuring period if they share bowls and it does not distress them.
Related: food calculator, weight log and ask the AI veterinary assistant. This checker gives general guidance and can't diagnose; your vet can test urine and blood to find a cause.
Sources
- Increased thirst and drinking — International Cat Care
- Polydipsia in Dogs and Cats (increased drinking) fact sheet — Willows Veterinary Centre & Referral Service
- A Stepwise Diagnostic Approach to Polyuria and Polydipsia — Today's Veterinary Practice
- Clinical approach to polyuria (normal drinking ranges) — dvm360