Can cats eat Milk?
Caution. Most adult cats are lactose intolerant. The classic 'saucer of milk' is a myth — milk commonly causes stomach upset and diarrhoea.
Key facts
- Verdict: Caution — some risk involved. See the detail below before giving milk to your cat.
- Category: Dairy
If your cat has eaten milk
- No emergency action for small amounts — just monitor for diarrhoea and vomiting.
- Call your vet if vomiting or diarrhoea is repeated or severe.
What's the full picture?
Kittens produce the enzyme lactase to digest the lactose in their mother's milk, but most cats lose this ability as they grow up. Feeding cow's milk to an adult cat usually causes digestive upset within a few hours.
Milk is not toxic — your cat won't end up in the emergency department from a lick of milk — but it's a common cause of vomiting and loose stools, and it has no nutritional value a cat can't get from proper cat food.
If you want to give your cat a 'milky' treat, use lactose-free cat milk sold in pet shops (e.g. Whiskas Cat Milk, Lick-E-Lix).
The image of a cat lapping at a saucer of milk is pure cultural habit — and it dates from farmyards, where cats drank fresh, fat-rich milk minutes from the cow while living on a hard-working outdoor calorie budget. The modern reality is that most adult cats are lactose-intolerant. Kittens produce lactase, the enzyme that digests milk sugar, but production falls away sharply after weaning. Pour semi-skimmed for an adult cat and the undigested lactose ferments in the gut, drawing in water and producing diarrhoea, wind, and stomach discomfort within 8–12 hours.
Cream, ice cream, and condensed milk are worse rather than better — the lactose is still there, plus a fat and sugar load that risks weight gain and, in susceptible cats, pancreatitis. Hard cheeses like mature cheddar contain much less lactose and a small cube is unlikely to cause harm, but they bring salt and fat a cat doesn't need. Lactose-free 'cat milk' sold in UK supermarkets and pet shops is the one milk product formulated to be safe, and even that is a treat to count within the daily 10% treat allowance, not a drink to leave down.
The main thing milk should never be is a substitute for water. Cats with constant access to fresh water — ideally moving water, which many cats strongly prefer — simply don't need milk of any kind.
Safer alternatives
- Lactose-free cat milk (Whiskas Cat Milk and similar)
- Fresh water
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Questions owners ask
Can kittens drink cow's milk?
No — even kittens shouldn't drink cow's milk. It lacks the right nutritional balance for growth and can cause diarrhoea. Orphaned kittens need a specific kitten milk replacer like Royal Canin Babycat Milk.
Is lactose-free milk safe?
Lactose-free human milk is better tolerated than regular milk, but it's still not recommended long-term. Purpose-made cat milk is the safer option.
Can cats drink cows' milk?
Most adult cats shouldn't. They lose the ability to digest lactose after kittenhood, so cows' milk typically causes diarrhoea, wind, and stomach upset within 8–12 hours. If you want to offer milk, use lactose-free cat milk from a pet shop or supermarket, in small amounts.
Can cats have cream or ice cream?
No — cream and ice cream combine the lactose problem with high fat and sugar. Regular amounts risk digestive upset, weight gain, and pancreatitis. Ice cream may also contain toxic extras like chocolate or, rarely, xylitol.
Can cats eat cheese?
A small cube of hard cheese like cheddar occasionally is unlikely to harm most cats, as hard cheeses are low in lactose. But cheese is high in salt and fat with no benefit for cats, so it's best kept to a rare treat — and avoid blue cheeses entirely.
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Related
Sources referenced for this guidance
- Veterinary Poisons Information Service (VPIS) — UK clinical toxicology reference used by vets
- International Cat Care — feline-specific clinical guidance
- BSAVA — British Small Animal Veterinary Association reference materials
- Merck Veterinary Manual — professional veterinary reference
About this guidance
Every entry on this site is compiled from published UK veterinary toxicology sources — International Cat Care, Veterinary Poisons Information Service (VPIS) references, RCVS-registered practice materials, and peer-reviewed feline medicine literature. Where the evidence is mixed, we err on the cautious side because cats are unusually sensitive to many common substances that are harmless to humans and even to dogs.
This is general information written for UK cat owners. It is not personalised veterinary advice for your specific cat, their age, weight, medical history, or the exact exposure you're dealing with. If your cat has eaten something or is unwell, call your vet first. The Animal PoisonLine on 01202 509000 is available 24/7 for a small fee and can tell you whether an emergency visit is needed.
Entries are reviewed and updated as new research emerges. Spotted an error? Let us know — corrections are investigated and applied within 24 hours. For more context on how we work, see about and our full disclaimer.
Last reviewed: · By the What Can My Cat Eat? editorial team