Why is my kitten drinking a lot of water?

A kitten drinking out of a fish tank
(Image credit: Getty Images)

When you have a new kitten, every change in its behavior can be concerning. You may wonder, just why is my kitten drinking a lot of water, or is my kitten drinking enough? You may be thinking cats hate water, surely that means they don’t drink much, but the hydration of your young cat is important and something you should try to monitor. 

Cats are notoriously secretive drinkers, even if it looks like they’ve drunk a lot, unless you’ve seen them, it may just be that you need to stop a cat from spilling their water bowl. The best kitten food is wet food, which is generally around 75 percent water, which gives your kitten most of the liquid they need, but you should still keep an eye out for signs of dehydration or excessive thirst.

Even if you’re thinking I ‘feed my kitten enough’, you might want to invest in one of the best pet water fountains, to inspire your kitten to drink more water. A small study in the Journal of Feline Medicine and Surgery indicates that cats prefer to drink from a moving water source. Read on to see what to do if your kitten isn’t drinking enough water or is drinking loads, both of which are cause for concern.

How much water does a kitten need to drink?

We spoke to PDSA vet Lynne James, who told us: "The amount of water a kitten drinks can vary depending on a number of things, including their diet, the temperature of their home, the amount of exercise they do, and how they like to drink. 

"Cats tend to drink no more than 50ml of water per kg of their body weight (i.e. 200ml for a 4kg cat), so if you find that your kitten is regularly drinking more than this, or you notice a change in the amount they drink, then it’s important to speak to your vet. Other signs of excessive drinking include being thirsty all the time, their water bowl emptying quicker than usual, drinking from places that they normally don't, and visiting their litter tray more often."

Why might a kitten drink a lot of water?

A kitten with a bowl of dry food and a bowl of water

(Image credit: Getty Images)

There are plenty of health-related reasons why a kitten or cat may be drinking a lot of water, but before we come to those, let's take a look at some less worrying reasons.

The most likely explanation, says Lynne James, is dietary. "Kittens fed a wet diet tend to get most of the water they need from their food," she says, "whereas those eating dry food often need to drink more." So if you'd like your kitten to drink less, the simple solution is to add more wet food to your kitten's diet. Obviously a bit of dry food on the side is good for your kitten's teeth, so don't ditch it completely, but a main dish of wet food will largely cover your kitten's fluid needs, leaving it requiring the occasional top-up from the water bowl.

Another thing to bear in mind is that kittens are going to be kittens, and that means a lot of tearing around the place, which in turn can leave them needing to drink more water. So again, if your kitten needs a long drink after an energetic play session, that shouldn't be any cause for concern.

On a similar note, an upwards change in temperature can result in your kitten needing to drink more water. It could be that the weather's heated up in the summer, or alternatively it might be really cold out so you have the heating turned up in doors, and either of these changes can leave your kitten feeling a bit dried out and in need of extra fluids.

Alternatively, it could just be that your kitten really enjoys drinking water. Lynne James tells us, "If your kitten likes flowing water from a tap or water fountain, you may find that they drink more when this is available to them, especially if they like to play with it at the same time!"

Potential health issues

Two kittens drinking from a water bowl

(Image credit: Getty Images)

Of course, there are a number of health-related issues that can explain why a kitten might be drinking a lot of water. With older cats there are a few obvious likely causes, as Lynne James explains: "As a cat gets older, increased thirst can be an indicator of a number of serious conditions, such as kidney disease, an overactive thyroid, liver disease and diabetes – which is why it’s so important to be aware of how much water your cat drinks through their life. The good news is that early diagnosis and treatment greatly improves the prognosis for most of these conditions."

In the case of kittens, however, these are less likely to be the cause of excess water consumption, although they can't be ruled out entirely. A more likely explanation is some kind of low-grade fever that you'd want to keep an eye on but which would clear itself within a few days. There's a slim possibility that your kitten has a form of early-onset diabetes; similarly metabolic and endocrine disorders might result in poor metabolism of water, leading to excessive drinking. The chances of these are pretty low, though.

If you're concerned about your kitten drinking a lot of water, Lynne James advises that the best place to start is to check exactly how much they are having each day. "To do this," she explains, "ensure their water bowl and any other water sources are empty and measure out a set amount of water in a jug. Put this water in their water bowls and note the time. 24 hours later, measure the remaining amount of water to see how much your pet has consumed – repeat over a few days so that you can calculate an average amount per day."

If you're concerned that your kitten's seriously over-drinking, or if it's displaying any symptoms of ill health, contact your vet for advice.


Kitten drinking from a bowl of water

(Image credit: Getty Images)

Most of the explanations as to why a kitten might be drinking a lot of water are, thankfully, pretty benign. It's more likely to do with its diet, the current temperature or the amount of activity it's up to, than something linked to your kitten's health. So while naturally you'll want to keep an eye on your kitten's drinking habits if they seem a little over the top, watch out for other warning signs and call your vet if you're concerned for your kitten's health.

Thanks to PDSA vet Lynne James. Vet charity PDSA provides free and low-cost vet care for those who struggle to pay treatment costs for their sick and injured pets.

Now that you know how much fluid your little one should be consuming on a daily basis, you might be keen to learn about their food intake. Our guide to ‘how often should I feed my kitten?’ has the answers.

Jim McCauley

Jim is a writer, performer and cat-wrangler based in Bath, who last year adopted a pair of sibling rescue cats who turned out to be effectively feral, and has spent a lot of time since then trying to get them accustomed to people (some success) and each other (ongoing project).