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Is Milk Good for My Cat? “Not really and here's why”

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What if your cat loves dairy, but even a treat-sized dollop of milk or cream leads to unpleasant symptoms like gas, diarrhea, or vomiting? Actually, that’s pretty normal. Most adult cats have trouble digesting dairy products because they lack the ability to break down lactose, the sugar found in milk. Lactose makes up between 2% and 8% of milk.

Is Milk Good for My Cat? Not really and here's why

What is lactose intolerance?

The sugar lactose is a kind of carbohydrate that is made up of two other sugars, galactose and glucose. In order to digest milk products properly, the body first has to break the lactose down into those two components. “Lactose intolerance” refers to an inability to separate lactose into its digestible parts.

Lactose intolerance is not an allergy. In an allergic reaction, the body’s immune system misidentifies a benign substance as an intruder and attacks it, causing various symptoms. Lactose intolerance is a digestive issue and doesn’t involve the immune system.

Cat ouside standing in the green grass

When lactose passes through the digestive tract without being broken down, it pulls extra water into the intestines. Then, to make things even worse, the gut’s resident bacteria get access to the undigested lactose and ferment it.

As a result, feeding milk to a lactose-intolerant cat may cause gas, vomiting, or diarrhea, usually within 8 to 12 hours. In addition, since the lactose can’t be processed and eliminated correctly, this sugar can linger in the digestive tract, continuing to cause gastrointestinal trouble long after the dairy is consumed.

Cute white kitten laying down

Don’t cats need milk?

Like other baby mammals, kittens need their mother’s milk to give them a healthy start in life. Among many other benefits, the mother’s colostrum and milk support the development of the gut microbiome, which is crucial for so many aspects of an animal’s health.

Kittens can process their mother’s milk because their digestive system produces an enzyme called lactase, which breaks lactose down into those two component sugars. But as soon as the growing kittens start eating solid food, their production of lactase slows way down, so that they no longer have enough to properly digest lactose. Since most mammals have no dietary need for milk once they’ve become adults, this reduction in lactase production—and therefore some degree of lactose intolerance—is actually the norm.

Cat with his tongue out, he wants milk

What if your cat craves dairy?

Cats may be attracted to milk, cream, or cheese because these foods taste fatty, but even as a treat, dairy products are generally not recommended for cats. For one thing, cow and goat milk both have a significantly higher lactose content than a mother cat’s milk, so they’re even more difficult for an adult cat to digest. And in cats with inflammatory bowel disease (IBD) or other intestinal disorders, dairy can make the existing digestive symptoms much worse.

What if your cat craves dairy?

Some dairy products—such as cottage cheese and yogurt—may be tolerated better than straight milk because the bacterial processes they undergo also break down some of the lactose.

As long as your cat has no digestive issues, feeding very small amounts of these foods may not cause trouble, but if your cat loves an occasional dairy treat, the safest choice is a little lactose-free cow’s milk. (Avoid soy, almond, and other nut milks; though these milk substitutes contain no lactose, they have been known to cause stomach problems in cats.)

Better yet, skip the dairy altogether. Adult cats have no need for dairy products in their diet, and what they need for proper hydration is plenty of fresh water, not milk.

Cat waiting for his food

Let us know if you have any questions or comments. If you liked this article please consider sharing it.

You might also enjoy reading, 9 Ways to Improve Your Cat's Gut Health.

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