TailVilleWhy
Young animals make plenty of lactase, the enzyme that digests milk sugar, but levels drop as they grow, so most adults become lactose intolerant. Despite the classic image of cats lapping milk, it commonly gives them diarrhea. Milk isn't toxic, but its fat and calories add up if given often.
How to give it / if eaten
If you want to offer some, start with a spoonful or two and check the stool afterward; lactose-free pet milk is a better choice. Keep treats under 10% of daily calories, and never give flavored milks like chocolate or strawberry.
Watch for these signs
Within hours to a day: loose stool or diarrhea, gurgling belly, gas, abdominal discomfort or vomiting. See a vet if diarrhea lasts more than a day.
FAQ
Can I give my cat milk?
Most adult cats get diarrhea from cow's milk. If you'd like to treat your cat, use a small amount of lactose-free cat milk.
Can I feed cow's milk to a kitten or puppy?
No. Cow's milk doesn't match what they need and can cause diarrhea and dehydration. Use a kitten or puppy milk replacer and check with your vet.
General information only. Weight, age and health conditions change how a pet reacts, so ask your vet if you are worried.