How much water should a cat drink? Keeping your cat hydrated in summer

Cats are light drinkers — it's in their nature. Descended from desert-dwelling wild cats, they have a weak thirst drive and historically got most of their water from their prey. The catch? In the summer heat, that weak reflex leaves them exposed to dehydration, with real consequences for their health. So how much water should a cat drink, and is yours getting enough? Here's how to tell — and, above all, how to help them drink more.

Why do cats drink so little?

To understand the risk, you have to go back to where cats came from. Their ancestors lived in desert regions and met almost all of their water needs through their prey, which is around 70% water. As a result, cats have kept a very weak thirst drive and don't instinctively think to drink much. A cat fed only on dry food, which contains little water, is therefore naturally prone to mild chronic dehydration — something that gets markedly worse in very hot weather, and in extreme cases can even pave the way for heatstroke.

How much water does a cat need?

As a general rule, a cat needs around 50 ml of water per kilo per day, counting the water that comes from their food. A 4 kg cat should therefore be aiming for around 200 ml a day. That figure is only a guide: it goes up with heat and activity, and depends a great deal on diet. A cat on wet food already covers a large share of their needs through what they eat, whereas a cat on dry food will have to drink more to make up for it.

How can I tell if my cat is dehydrated?

Several signs should put you on alert: lethargy, dry and sticky gums, sunken eyes, loss of appetite, or darker, scantier urine. The simplest test to do at home is the skin tent test: gently pinch the skin at the scruff of the neck, then let go. In a well-hydrated cat, the skin springs back into place straight away; if the fold takes a while to disappear, that's a sign of dehydration. If in doubt, contact your vet.

Why hydration is crucial for your cat's health

Keeping your cat well hydrated isn't just about summer comfort. Cats are particularly prone to urinary problems (crystals, cystitis) and kidney problems, and good hydration plays an essential protective role: it dilutes the urine, supports the kidneys and lowers the risks. Repeated dehydration, on the other hand, puts strain on organs that are already vulnerable. Making sure your cat drinks enough is an investment in their long-term health.

How to help your cat drink more

The good news: a few simple tweaks are often enough to increase water intake significantly.

Add more water stations, in the right places

Put out several water bowls in different rooms, so that a drink is always within reach. One detail matters a lot: place the water away from the food bowl and the litter tray. Instinctively, cats are reluctant to drink near where they eat or go to the toilet.

Choose the right bowl

Go for a wide, shallow bowl, where the whiskers don't brush against the sides — something many cats dislike. Avoid plastic, which can affect the taste and harbour bacteria, and opt for ceramic, glass or stainless steel instead. And change the water every day so it stays fresh and appealing.

Make the most of a water fountain

It's often the most effective solution: many cats are drawn to moving water and drink far more from a fountain than from an ordinary bowl. The water also stays fresher and better oxygenated.

Boost water through food

Wet food contains much more water than dry food, which makes it an excellent way to boost hydration. You can also add a little water or broth to their food, offer ice cubes, or a little homemade broth (no salt or onion, both toxic to cats). All ways to get your cat drinking without them even noticing.

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When to see a vet

If you notice signs of dehydration, or if your cat refuses to drink and seems listless, see a vet without delay. Watch out for the opposite sign too, which is often misread: a cat who suddenly starts drinking much more than usual isn't necessarily “well hydrated”. Excessive thirst can in fact point to a health problem, such as kidney disease, diabetes or a thyroid disorder. In that case too, a trip to the vet is a must.

Outside hot spells, the underlying question stays the same: is your cat drinking enough day to day, and is a bowl up to the job? The answer depends mainly on their diet — we've gone into it in detail in water fountain or bowl.

In short

Because they drink little by nature, cats are vulnerable to dehydration, especially in summer. Watch for the signs (including the skin tent test), and make things easy for them: several well-placed water stations, a suitable bowl, a fountain and some wet food in their diet. Hydration also goes hand in hand with the steps for keeping your cat cool during heatwaves. Good hydration means a livelier cat and better-protected kidneys. And at the slightest marked change in the way they drink, in either direction, ask your vet for advice.