What Do Cats Drink? Hydration Guide for Cats

FEEDING GUIDE

What Do Cats Drink?

Water is all a healthy adult cat needs to drink, but milk myths persist. Learn the lactose truth, tasty hydration tricks, and kitten rules.

By Emily Carter · Reviewed by our vet team · Updated October 2026

Best Fresh waterMyth Milk is badKittens Mother’s milk, then water

Best: Fresh water  ·  Adults: Water only  ·  Kittens: Mother’s milk, then water

The classic image is hard to shake: a kitten hunched over a saucer of milk, lapping away while purring like a tiny engine. Cartoons, picture books, and greeting cards have repeated that picture for generations. The trouble is that it is misleading, and the real story of feline hydration is far simpler than the myth.

What Do Cats Drink?

Set the milk myth aside and the answer is refreshingly simple.

Water. That is the complete answer to what do cats drink for the great majority of cats. Alongside a healthy balanced diet, plain water covers everything an adult cat needs in the bowl. Hydration matters for every cat, and it matters even more for cats dealing with health problems like kidney disease, where steady fluid intake supports the body day after day.

Exactly how much water a cat needs depends on age, size, existing health issues, and the mix of wet versus dry food in the diet. A cat eating canned food already takes in plenty of moisture with meals, while a cat eating only dry kibble leans more heavily on the water bowl. Either way, keep clean fresh water available at all times, and refresh it daily.

Cats can be particular about how water is served, so do not be surprised if yours snubs a bowl that sat out too long. If your cat seems uninterested, try a fresh pour in a clean bowl placed away from the food. Small tweaks like these appeal to feline tastes and often get a reluctant drinker sipping again.

At a Glance

Can Cats Drink Milk?

This is the question the cartoons got wrong.

The familiar saucer of milk comes with two problems. The extra fat can unbalance an otherwise balanced diet, and the extra calories raise the risk of a cat drifting toward overweight over time. Milk is a treat the body never asked for, not a health drink.

Then there is lactose. Most adult cats are lactose intolerant, which means dairy can trigger vomiting or diarrhea. Kittens are the exception: they carry an intestinal enzyme that breaks down the lactose in their mother’s milk. As they mature they lose that enzyme, so the lactose in cow’s milk ferments in the gut and upsets the stomach instead of nourishing the cat.

Reduced lactose milk products exist for cats, and an occasional small serving is unlikely to cause drama. Treat them strictly as a treat: use them in moderation and never as a replacement for water. Remember too that milk can cause diarrhea, and diarrhea raises the risk of dehydration, which is the last thing a cat with kidney trouble needs. So what do cats drink instead? Fresh water, with a few meaty extras as backup for reluctant drinkers.

Do Cats Drink Water?

Some cats act unimpressed by the water bowl. They still need it.

Cats experience taste differently from us. They detect sour, bitter, salty, and umami flavors, but they cannot taste sweetness at all. As obligate carnivores they gravitate toward the flavors of animal ingredients, which explains why a splash of something meaty gets far more attention than plain water ever will.

Plain water should still be the daily default. Every healthy adult cat can meet its fluid needs from water alone, and asking what do cats drink will keep coming back to the same honest answer. Watch the bowl across the day: a cat that drinks steadily, eats well, and uses the litter box normally is usually hydrating just fine.

Talk to your vet promptly if drinking habits change suddenly. Drinking far more or far less than usual can signal a health issue, and cats with kidney disease need their hydration watched with extra care. When in doubt, a quick call beats a long guess.

What Can Cats Drink Besides Water?

Water is the foundation. These extras can make it more tempting.

Knowing what do cats drink is only half the battle; making the water appealing is the other half. To encourage a reluctant drinker, try offering the cooled cooking liquid from boiled plain chicken breast or white fish. Cook it with no salt and no oil, and skim the fat from the surface before serving. The gentle meaty flavor speaks directly to feline taste buds.

A couple of teaspoons of tuna juice stirred into meals works the same magic, and a broth formulated for cats can serve as a tasty mealtime complement. Your vet can also suggest hydration supplements designed for cats, which take the guesswork out of the process.

Food itself is a hydration tool. If your cat eats only dry food, mixing in some wet food makes a real difference, since canned food can be up to 75 percent water. For cats that need extra support, ask your vet about oral rehydration fluids with a meaty flavor. Every option here plays backup to the main answer of what do cats drink: fresh water, first and always.

What Should Kittens Drink?

Kittens start life on milk, but the menu changes fast.

Before weaning, a kitten’s hydration comes entirely from mother’s milk, which delivers both nutrition and fluids in one package. During this stage the mother needs constant access to fresh water of her own, and curious kittens may start showing interest in her bowl well before they can use it properly.

Weaning begins at around 3 to 4 weeks of age. As soon as solid food enters the picture, set out a shallow bowl of fresh clean water nearby. The low sides make it easy for tiny legs and wobbly balance, and having water beside the food encourages drinking right through the transition.

From weaning onward, water becomes an essential part of the diet, exactly as it is for adults. Keep a fresh bowl available at all times and appeal to your kitten’s tastes if drinking seems slow to start. The habits built in these early weeks often stick for life, which makes this the perfect time to settle what do cats drink in your home: fresh water, every day.

FAQs

Can I give my cat milk as an occasional treat?

A small serving of reduced lactose milk now and then is unlikely to harm most cats. Keep portions tiny, offer it only in moderation, and never let it replace water. If your cat shows any sign of stomach upset, skip the milk entirely.

Why does regular milk upset my cat’s stomach?

Most adult cats are lactose intolerant because they lose the intestinal enzyme that digested milk in kittenhood. Without that enzyme, the lactose in cow’s milk ferments in the gut, which leads to vomiting or diarrhea. This is also why the answer to what do cats drink stays plain water rather than dairy.

My cat barely touches the water bowl. What should I do?

Start with the easy wins: fresh water daily, a clean bowl, and a spot away from the food. Then add moisture through wet food, a little tuna juice, or cooled cooking liquid from plain boiled chicken. If low intake continues, talk to your vet, especially for older cats or cats with kidney disease.

When do kittens start drinking water?

Kittens begin weaning at around 3 to 4 weeks, and that is the moment to introduce water. Offer it in a shallow bowl beside their first solid foods. From that point on, water is an essential part of the diet, just as it is for grown cats.

What do cats drink if they refuse plain water?

Start with the basics: a clean bowl, a fresh pour, and a spot away from the food. Then tempt with toppers like tuna juice, cooled cooking liquid from plain boiled chicken, or a broth formulated for cats. Keep plain water available alongside, since the goal is to lead a reluctant drinker back to the bowl, not away from it.

Can cats taste sweetness in flavored drinks?

No. Cats cannot taste sweet flavors at all, though they detect sour, bitter, salty, and umami. That is why meaty flavors tempt them while sugary drinks do nothing. Stick to savory toppers with animal ingredients when you want to make water more appealing.

The Simple Takeaway on What Do Cats Drink

After all the myths, the truth fits in one line.

Fresh water wins. It is the safest, simplest, and most complete answer to what do cats drink, for kittens finding their first bowl and for seniors managing their health. Keep it clean, keep it fresh, and keep it available, and use the meaty extras above only as backup. Want to keep learning? Explore our other feeding guides for cats to build meals and hydration habits your cat will thrive on.