Can Cats Drink Milk – The Surprising Truth Every Cat Owner Should Know

The image of a cat drinking milk from a bowl is one of the most iconic images in popular culture. Comics, cartoons, advertisements — everywhere we see a cat and milk as the perfect combination. But science tells a completely different story and the truth may surprise you. Most adult cats should not actually drink cow's milk and here is why. Why Cats Are Lactose Intolerant Like many mammals including a large portion of the human population, adult cats are in most cases lactose intolerant. Lactose is the sugar found in milk and digesting it requires an enzyme called lactase. Kittens have sufficient lactase to digest their mother's milk while nursing but as they grow and stop nursing the production of lactase naturally declines. By adulthood most cats have insufficient lactase to efficiently digest the lactose in cow's milk. The result is that lactose passes undigested through the digestive tract where bacteria in the intestines begin to ferment it causing gas, bloating, stomach pain, and diarrhoea. Symptoms That Occur If your cat drinks cow's milk symptoms typically appear between 8 and 12 hours after consumption. The most common symptoms are soft or liquid stool or diarrhoea, increased gas production and bloating, stomach pain and cramps that manifest as restlessness and hunching, and vomiting in more severe cases. The intensity of symptoms varies from cat to cat — some cats are more tolerant than others and can drink a small amount of milk without visible consequences while others react even to small quantities. Why Cats Love Milk If It Harms Them This is one of the most interesting questions — if milk causes discomfort why do cats love it so much? The answer lies in the high fat content of full-fat milk. Cats are obligate carnivores that naturally seek foods rich in fats and proteins and milk is extremely attractive to them at an olfactory level precisely because of those fats. The taste of fat is naturally pleasant for cats regardless of the consequences for the digestive system. Similar to how we sometimes eat something we know does not agree with us simply because we enjoy the taste. Are All Milks the Same Cow's milk is the most problematic due to its high lactose content. Goat's milk has somewhat lower lactose content and some cats tolerate it better but it is still not ideal. Plant-based milks such as soy, almond, and oat milk are not toxic to cats but have no nutritional value for them and some may contain additives that are not suitable for cats. There are specially formulated cat milks sold in pet stores — these are lactose-free or very low lactose milks that are safe for cats. If you want to give your cat this treat that is the only recommended option. What Cats Actually Need to Drink The only drink that is truly necessary and healthy for cats is clean fresh water. Cats evolved in arid environments and naturally have a low thirst drive — in the wild they obtain most of their fluid intake through eating fresh prey. Dry kibble contains only about 10 percent moisture while wet canned food contains 70 to 80 percent moisture. Cats that eat exclusively dry food often do not drink enough water which can place long-term strain on the kidneys. Water fountains are an excellent solution as many cats prefer running water over still water. The Milk and Cats Myth — Where It Comes From The image of a cat drinking milk has historical origins. Before the era of industrially processed food, farm cats lived near dairies and had access to fresh milk which had significantly lower lactose content than modern pasteurized full-fat milk. Additionally farm cats were far more active and had a more varied diet so milk was only a small part of total intake. The modern urban cat living exclusively indoors and drinking larger amounts of full-fat milk is in an entirely different situation. What If Your Cat Has Already Drunk Milk If your cat drinks a little milk and shows no symptoms there is probably no cause for concern — it is simply more tolerant than average. Monitor it for the next 12 hours. If symptoms such as diarrhoea or vomiting appear ensure it has access to fresh water and wait for the symptoms to pass on their own — they usually resolve within 24 hours. If symptoms are severe or do not pass contact your veterinarian. Share your experiences about feeding your cats, ask experienced owners for advice, and find verified breeders on PetFriendsForever. 🐱