Q: I've heard it's bad to give cats milk to drink. Is this true?
A: Adult cats do not require milk as a part of their diet. Young kittens require their mothers' milk only while they are still nursing. This milk contains nutrients and antibodies that help kittens grow and stay healthy.
Once cats mature, many become lactose intolerant. This makes cow's milk a poor choice to use as a treat for your cat. Milk can cause your pet to have stomach ailments and indigestion since they are not used to it. In some cases milk can actually make your cat very ill and cause vomiting and/or diarrhea.
If you really want to give your cat milk, most pet stores carry lactose free milk made especially for cats. This can provide a good substitute to cows' milk and can be a good treat.