Skip to main content

Are cats lactose intolerant? What you need to know

You’ve surely seen those old-time drawings of kittens drinking from saucers of milk. It’s common knowledge that kittens drink their mother’s milk, so why shouldn’t they be able to drink cow’s milk out of the fridge? And the same goes for your cat. Many cats develop a love of dairy items like cheese and butter, so is it really bad to feed your cat these items? Before you feed your cat dairy, it’s important to understand how his body works and what effect dairy can have on it. That way, you can choose food and treats that will support your cat’s health and nutrition.

Older kitten in a yard drinking out of a bowl of milk
Image used with permission by copyright holder

Are cats lactose intolerant?

Kittens drink their mother’s milk, which has lactose in it, and they’re just fine — but that’s because their bodies have the enzyme lactase, which lets them digest milk properly. As kittens age, their bodies produce less lactase, making it more difficult for them to digest milk. Eventually, kittens stop producing that enzyme entirely, and many become unable to properly digest lactose, meaning they’re lactose intolerant.

When a kitten or cat is lactose intolerant, they usually experience an upset stomach after consuming milk. Diarrhea is common, and some cats will also vomit. Those symptoms can start up within about eight hours after the cat drinks milk, so watch your cat carefully if he’s had access to milk.

Some cats seem to digest milk or other dairy products just fine. Symptoms can vary between cats, and different types of dairy products contain different amounts of lactose. Some cheeses, for instance, may have less lactose than milk does, and a cat may be able to digest them more easily.

Can kittens drink regular milk?

Most kittens will get all the milk they need from their mothers, but orphaned kittens or kittens whose mothers are sick may need supplemental nutrition. Regular cow’s milk can upset their stomachs since it’s quite high in lactose. Cow’s milk also has a distinctly different nutritional makeup than cat’s milk, so you can’t rely on it to give kittens the nutrition they need. Instead, it’s much better to feed them a kitten milk replacer.

When feeding kittens, you’ll need to feed them frequently, and the timing of feedings will depend on the kittens’ age. If you’ve never cared for young kittens before, then quickly seek out vet help. Your vet can guide you and help you come up with a feeding and care plan. They can also recommend the best product for your kittens and help you monitor their weight and ensure they’re growing as they should.

Newborn kitten being fed with a bottle
Image used with permission by copyright holder

Should you feed your cat cheese, milk, and other dairy?

Even though some cats may not be able to properly digest dairy products, that doesn’t mean they won’t still beg for them when you’re making a pizza or eating cereal with milk. Dairy products can lead to digestive upset, though, so while you might think you’re being nice by sharing your food with your cat, you’re really not helping him in the long run.

You can choose from plenty of dairy alternatives that are much better treats for your cat.

  • If your cat loves the taste of milk, then consider buying a cat milk product designed to be easy for cats to digest. These milks are lactose-free and much easier on your cat’s stomach.
  • You can also feed your cat one of many commercially available treats. They come in a wide array of options, including liquid treats and food toppers with a creamy texture similar to dairy products.
  • If you want your cat to share a taste of your human food, then consider giving him a bit of boiled chicken or cooked salmon. These treats (when fed in moderation) are healthy and safe for your cat, as long as they’re cooked and not topped with butter or spices.

Milk is a core element of a kitten’s nutrition but only while that kitten is young. Giving your cat dairy products as he ages can lead to digestive upset. Instead, always choose a food that’s safe for your cat and that he can properly digest. Avoid anything with lactose, so all dairy products are out. When feeding your cat treats, remember that you should give him only a few per day. Even when feeding treats designed for cats, giving your cat too many can be a sudden change to his system and upset his stomach. Indulge him in just a few treats to keep your cat healthy and to keep those foods extra-special to your cat.

Editors' Recommendations

Paige Cerulli
Former Digital Trends Contributor
Paige's work has appeared in American Veterinarian, Business Insider, Healthline, and more. When she's not writing, Paige…
Why do cats lick themselves? It goes beyond just cat grooming
This totally normal behavior could mean a few different things
A cat licking his paw while lying in front of a blue background

Cats spend the majority of their time doing one of a few things: eating, resting, grooming, using the litter box, or causing havoc. Their routines can become predictable at times, so it's not even worth a second glance when you catch your cat licking themselves as obviously -- and loudly -- as possible. Cats groom themselves all the time, after all, but when does licking become a bit too much?
Even though cat grooming is completely normal, if it becomes noticeably excessive, your kitty may be licking themselves -- or even licking you -- for another reason. Luckily, we can help you understand why cats lick themselves and how you can tell what may be going on. Here's what you'll want to know and what to look out for.

Is my cat grooming? When licking is normal

Read more
Why do cats open their mouths when they smell? It’s for a really cool reason
The Flehmen response is a little-known reaction in felines that allows them to take in more of their surroundings
A white and tabby cat with their mouth open

Think of the last time you smelled something foul. How did you react? If you're truly made of steel, you may not have reacted at all, but for most people, it's impossible not to flare your nostrils at least. You may have even made a face! All of these reactions are perfectly natural, though humans aren't the only species that reacts to smells, both good and bad. Even your cuddly cat sniffs out the world around them sometimes,
If you've ever noticed your cat reacting to a smell, you're not alone. Some folks have even noticed their cat opening their mouth -- and even sticking out their tongue -- while smelling, but it's not so clear what this means. Is this a reaction to a scent, or is it just a way to get an extra thorough sniff? Whatever it may be, we're here to find out.
Needless to say, you're not alone if you're wondering, "Why do cats open their mouths when they smell?" We've scoured trusted sources to find out, and this is what we know.

Why do cats open their mouths when they smell?
Watching your curious cat open their mouth in a kind of sneer while they get a good sniff of something can raise a lot of questions -- it's understandable. When people do this, it's usually a response to an unpleasant smell, but when cats do this, they're actually trying to get a better understanding of the scent in the air.

Read more
What does it mean when cats purr? It’s more scientific than them just being happy
Cat purring is thought to indicate happiness, but it can have a few different meanings
Black and white cat lying on a cat bed on a sofa

Chances are, you've heard that purring is a sign that a cat is happy. And in many cases, that's true. Cats often purr during activities they enjoy, like being petted in that hard-to-reach spot or settling down for a nap in the sun. However, purring can have different meanings and causes than just indicating happiness.

Scientists are still working to understand this feline behavior fully, and new theories about the reasons behind purring continue to evolve. So, why do cats purr, and what does your cat's purr really mean? New information may be coming out every day, but the information that we already have can help you better understand your cat.

Read more