Cats have long been linked in people's minds with a saucer of milk, an image so familiar it almost feels like a natural part of feline life. But this image, cemented through centuries of stories, art, films, and cartoons, hides a very different reality: most cats can't properly digest milk, and drinking it can lead to uncomfortable, sometimes serious, health problems.
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So how did this famous association between cats and milk actually come about? And why does this food seem so beloved by cats in popular imagination, when most cats' bodies can't actually tolerate it?
To understand that, we need to go back to the beginning of the long relationship between cats and humans.
How Did the Cat-Milk Connection Begin?
Cats have a long history with humans stretching back more than 9,000 years. They were drawn to human settlements because of the rodents that plagued our ancestors, sometimes quite literally. Cats quickly won humans over thanks to their usefulness in hunting mice, growing accustomed to people and gradually becoming domesticated, according to The Independent.
Farmers began relying on cats for pest control, and it was through this shared role that the first connection between cats and milk emerged.
Before commercial pet food existed, cats often lived off household food scraps, and their nutritional needs weren't well understood at the time. In his 1877 book on cats, Scottish physician Gordon Stables stressed the importance of providing a cat with two bowls, one for water and one for milk, and even suggested porridge and milk as an excellent breakfast for cats.
From these roots, the image of cats and milk became firmly embedded in the collective imagination, further reinforced by depictions of milk-loving cats in art, books, films, and cartoons. There's even a classic recurring image in stories and artwork: a scruffy stray cat rescued from the rain, before happily lapping up a saucer of milk offered by a kind stranger.
So it's no surprise that milk and cats continue to be seen as an inseparable, flawless pairing. But research now paints a different picture: in most cases, cats shouldn't be drinking milk at all.
The Vast Majority of Cats Are Lactose Intolerant
Like all mammals, cats begin life drinking their mother's milk. But once they move past kittenhood, milk becomes an entirely unnecessary part of their diet.
After weaning, which typically happens between 6 and 12 weeks of age, kittens stop producing the enzyme lactase needed to digest the lactose found in milk. This means the vast majority of adult cats are lactose intolerant.
As with humans, the degree of lactose intolerance varies from cat to cat, depending on how much lactase the body naturally continues to produce.
That said, milk shouldn't be given carelessly even to kittens. The fact that kittens can digest lactose doesn't mean they should be drinking cow's milk.
Cats are much smaller than cows, and it's natural for the lactose content in a cat's mother's milk to be far lower than that in cow's milk. So it's best for a kitten to keep nursing from its mother, or to be given a milk substitute specifically formulated for kittens.
Lactose intolerance isn't the only reason to avoid giving cats milk; cats can also, though rarely, develop an allergy to milk or dairy products.
What Happens to Cats That Drink Milk?
Lactose is a type of sugar. When it can't be broken down and absorbed into the bloodstream, it travels through the intestines until it reaches the colon, where bacteria in the gut ferment it.
This fermentation process breaks lactose down into acids and gases, causing a range of unpleasant symptoms, including excessive gas, bloating, constipation, abdominal pain, and sometimes nausea and vomiting. In cats, diarrhea is the most common symptom.
Chronic or persistent diarrhea can lead to further complications, such as dehydration, electrolyte imbalances, and malnutrition, and can even become life-threatening in some cases.
Cats that regularly consume milk or dairy products as part of their diet are at greater risk of developing these health complications.
So the image of a cat happily lapping up a saucer of milk isn't necessarily a picture of a suitable food for them, it's largely the product of a long history of habit and stereotype. Nutritionally speaking, once weaned, a cat has no need for milk, and giving it to them can be a source of digestive problems that could easily have been avoided.
