How much water should a cat drink? (And how to help them drink more)
Cats are famously casual about drinking. Their wild ancestors got most of their water from prey, so many pet cats don’t feel thirsty until they’re already a little short. If your cat eats mostly dry food and spends long days indoors, it’s worth knowing what “enough” looks like.
How much water does a cat need?
A widely used rule of thumb is around 50ml of water per kilogram of body weight per day. Cats Protection gives similar examples: roughly 200ml a day for a 4kg cat and 300ml for a 6kg cat.
| Cat’s weight | Total water per day (approx.) |
|---|---|
| 3kg | 150ml |
| 4kg | 200ml |
| 5kg | 250ml |
| 6kg | 300ml |
That total includes the water in their food. Wet food is around three-quarters water, so a cat on a wet diet will drink much less from the bowl, and that’s normal. A cat on dry kibble has to get nearly all of it by drinking.
Signs your cat might not be drinking enough
- The water bowl barely goes down from one day to the next.
- Small, infrequent or very dark wee in the litter tray.
- Dry, tacky gums.
- Skin on the back of the neck that’s slow to settle back when gently lifted.
- Lethargy or a dip in appetite.
Any sudden change in how much your cat drinks, more or less, is worth a call to your vet. Drinking much more than usual can be an early sign of conditions like kidney disease or diabetes.
7 ways to get your cat drinking more
- Move the water away from the food. Many cats prefer not to drink right next to where they eat.
- Offer more than one water spot. A bowl in a quiet room upstairs and one downstairs means fewer excuses.
- Use a wide, shallow bowl. Some cats dislike their whiskers brushing the sides.
- Keep it fresh. Change the water daily and wash the bowl regularly; stale water is easy to ignore.
- Try moving water. Plenty of cats are drawn to a dripping tap. A cat water fountain keeps water circulating and filtered all day. Research on whether fountains increase how much cats drink is mixed, so think of it as worth a try rather than a guarantee. Many owners find their cat visits the fountain more often than the bowl.
- Add some wet food. Even one wet meal a day noticeably raises total water intake.
- Add water to meals. A splash of water mixed into wet food is an easy win.
Is a cat water fountain worth it?
For a cat that ignores still water, or a household out at work all day, a fountain is a sensible upgrade. Look for one that’s easy to take apart, as you’ll want to clean it weekly. Stainless steel is easier to keep clean than plastic and doesn’t hold smells. A replaceable filter catches hair and bits of food.
Ours is a 2.5L stainless steel fountain with a quiet pump, a water-level window and 7 filters in the box. That’s about five days of water for one cat, so it’s still full when you get home late.
Quick answers
Is it normal for my cat to hardly drink?
If they eat mostly wet food, yes. Most of their water comes from their meals. On dry food, you should see the bowl go down every day.
Can cats drink milk instead?
No. Most adult cats are lactose intolerant, and milk can upset their stomach. Water is all they need.
How often should I clean a cat fountain?
Top it up as needed, rinse it weekly, and change the filter every 2–4 weeks, or more often with several cats.
This article is general guidance, not veterinary advice. If you’re worried about your cat’s drinking, speak to your vet.
Sources: Cats Protection; VCA Animal Hospitals.