Is your cat drinking enough water?

Cats have a reputation for being fussy drinkers, and there's some truth to it. Many owners never see their cat at the water bowl and start to worry something is wrong, when in fact a lot of a healthy cat's water intake comes from their food rather than a bowl. Knowing what "enough" actually looks like takes the guesswork out of it.

The trouble is that low water intake in cats is rarely dramatic. It creeps up gradually, especially in cats fed a mostly dry diet, and by the time you notice a change it can already be affecting their bladder or kidneys. The good news is that encouraging a cat to drink more is usually straightforward once you understand what puts them off in the first place.

This guide covers how much water cats actually need, why so many drink less than they should, the signs that intake has dropped too low, and the practical changes that make the biggest difference.

How much water does a cat actually need

Cats Protection's veterinary guidance gives a useful rule of thumb: total daily water intake (from both drinking and food) works out at roughly 50ml per kilogram of bodyweight, scaling up with size. As a guide, they suggest a small kitten of around 1.4kg needs about 70ml a day, a 2.7kg six-month-old kitten around 135ml, an average 4kg adult cat around 200ml, and a larger 6kg cat around 300ml.

That figure is a starting point, not a strict target to measure at the bowl. Diet, age, activity, weather and health all shift it, and Cats Protection is clear that "how much your cat drinks will depend on their age, size, diet and any health conditions." A cat on an all-wet diet might barely touch their water bowl and still be perfectly hydrated, because they're getting most of their moisture from their food.

Why wet and dry food make such a difference

The single biggest factor in how much a cat drinks from a bowl is what's in their food bowl. Wet food is typically around 70–80% water, so a cat eating mostly wet food is already taking in a large share of their daily fluid needs before they ever visit the water bowl. Dry kibble, by contrast, contains very little moisture, so a cat on a dry-only diet has to make up the shortfall by drinking considerably more.

This matters because cats are notoriously poor at compensating fully for a low-moisture diet just by drinking more. Domestic cats descended from small wildcats adapted to arid environments, historically getting most of their fluid from the moisture-rich prey they ate rather than from open water. That evolutionary history means many cats simply don't have a strong instinct to actively seek out water, which is part of why dry-fed indoor cats are considered more at risk of concentrated urine and lower overall fluid intake.

If your cat is exclusively dry-fed and rarely seen drinking, mixing in some wet food, or adding a little water to their kibble, is one of the most effective ways to lift their daily fluid intake without relying on them to drink more from a bowl.

Signs your cat isn't drinking enough

Because cats hide illness well, a drop in hydration is often only picked up when it's already become a problem. A few practical checks can help:

• Skin tenting: gently lift a pinch of skin between your cat's shoulder blades and let go. In a well-hydrated cat it should spring back almost instantly. If it stays "tented" for a couple of seconds before flattening, that can be a sign of dehydration — though this test is less reliable in very thin or elderly cats, who naturally have looser skin regardless of hydration.
• Gums: healthy gums are moist and slick to the touch. Dry, tacky, or sticky-feeling gums can indicate dehydration.
• Eyes: sunken-looking eyes are a sign of more significant fluid loss.
• Behaviour: lethargy, reduced appetite, and general dullness often accompany dehydration, though they're also signs of many other problems.
• Litter tray habits: smaller, darker, stronger-smelling urine can suggest a cat isn't taking in enough fluid, while significantly increased urination is its own red flag (see below).

None of these signs are exclusive to simple low water intake — they can also point to illness — so persistent or combined signs are always worth a vet visit rather than a wait-and-see approach.

Common reasons cats avoid the water bowl

Most "won't drink" cats aren't actually being difficult; they're responding to something about the setup that puts them off. According to Cats Protection, cats generally prefer their water kept well away from both their food bowl and their litter tray, since in the wild this separation would help avoid contaminating a food source or drinking near waste. A bowl positioned right next to the food dish, or anywhere near the litter tray, is often simply ignored.

Bowl shape and material matter more than most owners expect. Deep, narrow bowls force a cat's whiskers to brush against the sides with every sip, which some cats find genuinely uncomfortable — a phenomenon often referred to as whisker fatigue. A wide, shallow dish avoids this. Material counts too: many cats show a preference for ceramic or glass over plastic, possibly because plastic can hold onto odours and affect the taste of the water, and metal bowls can rattle or reflect light in a way some cats find off-putting.

Freshness is another common culprit. Water left standing for a day or two can pick up dust, hair, and a stale taste, and Cats Protection specifically recommends refreshing bowls daily and washing them regularly to stop this putting cats off.

Simple changes that encourage more drinking

Once the obvious deterrents are ruled out, a few small adjustments tend to make the biggest practical difference:

• Multiple bowls, multiple rooms. Rather than relying on one bowl, place water in two or three locations around the home — including a different floor if you have stairs — so your cat is never far from a drink and isn't forced to walk past something that puts them off, like the dog's bed or a busy hallway.
• Keep it separate. Position water away from food bowls and well away from the litter tray.
• Go wide and shallow. Swap deep bowls for wide, shallow ceramic or glass dishes, filled close to the brim so whiskers don't need to touch the sides.
• Wash daily. Rinse and refill bowls with fresh water every day, and give them a proper wash with mild detergent every few days to stop a biofilm building up.
• Experiment with water type. Some cats have a genuine preference for cooler water, filtered water, or even rainwater over tap water; a little trial and error can reveal what your own cat responds to.

Cats Protection's advice puts it simply: cats prefer their water "kept at a distance from their food bowl and litter tray, to avoid cross-contamination."

Running water and pet fountains

A striking number of cats show a strong preference for moving water over the still water in a bowl — the same instinct that has many cats fascinated by a dripping tap. Both Cats Protection and VCA Animal Hospitals list water fountains among the most effective tools for encouraging reluctant drinkers, since the movement and sound seem to draw cats in even when a perfectly clean bowl sitting nearby is ignored.

A pet water fountain is a reasonably low-cost way to test this theory without leaving a tap running. Look for one that's easy to take apart and clean, since the pump and filter can build up grime quickly, and clean it on a proper schedule — a fountain that's gone stagnant defeats the purpose entirely. If your cat responds to your kitchen or bathroom tap, that's a strong hint a fountain is worth trying.

Making water more appealing

For cats who are reluctant drinkers even with a good bowl setup, a little extra encouragement can help without doing any harm:

• A splash of flavour. Cats Protection and VCA both suggest a small amount of tuna juice (from tuna packed in water, not oil) or a little low-sodium, plain chicken or fish broth mixed into water can tempt a cat who's otherwise avoiding the bowl. Keep it occasional and always choose low-sodium, onion- and garlic-free options, since both onion and garlic are toxic to cats.
• Ice cubes. Some cats enjoy batting at and licking an ice cube dropped into their water bowl on a warm day.
• Wet food toppers or gravy. A small amount of wet food, or the juice from it, added to a meal boosts moisture intake even if your cat's water bowl usage doesn't change at all.

If you're ever unsure whether something is safe to add to your cat's food or water, our Can My Pet Eat This? tool is a quick way to check.

Hot weather and extra fluid needs

Warm weather increases a cat's fluid needs the same way it does for people, and it's worth being a little more proactive during a heatwave. Keep water bowls topped up and check them more than once a day, since evaporation and a thirstier cat can empty a bowl faster than usual. Adding an extra bowl or two in cooler spots of the house, and keeping curtains or blinds drawn during the hottest part of the day, helps cats stay comfortable and reduces how hard their body has to work to regulate temperature, which in turn reduces fluid loss.

Cats that are elderly, overweight, flat-faced, or living with an existing health condition are more vulnerable to heat and dehydration, so it's worth watching them a little more closely when temperatures rise.

When reduced or increased drinking signals a health problem

A genuine, sustained change in how much your cat drinks — in either direction — is one of the more reliable early warning signs in cat health, and it's worth taking seriously rather than assuming it will pass.

Increased thirst is a hallmark sign of several common conditions in older cats, most notably chronic kidney disease (CKD) and diabetes. PDSA explains that cats with CKD often drink and urinate more than usual as their kidneys become less able to concentrate urine, yet — somewhat counterintuitively — these same cats are prone to becoming dehydrated, because the kidneys can't retain fluid effectively even as the cat tries to compensate by drinking more. This combination of "drinking more but still dehydrated" is one reason CKD needs proper veterinary diagnosis rather than home management. CKD becomes increasingly common in cats from around eight years old, which is why vets often recommend more frequent health checks and blood or urine tests for senior cats.

Reduced drinking, on the other hand, is more often linked to reluctance around the bowl itself, a change in diet, or, in some cases, dental pain, nausea, or general illness making a cat less interested in food and water alike.

Either pattern, if it lasts more than a day or two or comes with other symptoms, deserves a vet visit rather than trial and error at home.

When to see your vet

Contact your vet promptly if your cat:

• Shows signs of dehydration (tented skin, dry gums, sunken eyes, lethargy)
• Has a noticeable, sustained increase or decrease in how much they're drinking
• Is urinating noticeably more, less, or with visible straining or blood
• Has stopped eating or drinking altogether, even for a single day
• Is vomiting or has diarrhoea alongside reduced water intake, which increases the risk of dehydration quickly

Dehydration and changes in thirst can be early signs of manageable conditions like kidney disease or diabetes, and catching them early generally makes ongoing treatment easier and more effective. Never try to withhold or restrict a cat's water, and never attempt to treat suspected dehydration yourself with fluids at home — this needs a vet's assessment.

*This is general guidance, not a substitute for advice from your vet, who can assess your individual pet.*

Sources

• Cats Protection — cats and drinking, water needs by diet and age (cats.org.uk).
• Cats Protection — "How much water should a cat drink?", ml-per-bodyweight guidance (cats.org.uk).
• Cats Protection — "8 tips to get your cat to drink more water" (cats.org.uk).
• PDSA — chronic kidney disease in cats, thirst and dehydration (pdsa.org.uk).
• VCA Animal Hospitals — tips to encourage cats to drink more water (vcahospitals.com).