The classic image of a cat is with a bowl of milk.  You are not doing you cat a favor by feeding her dairy products. Some cats can tolerate a little pasturized milk as an occasional treat but as your cat ages, she will likely become lactose intolerant and find it difficult to digest the sugar in milk.  Many cats, especially adults get diarrhea after drinking dairy.  Even if you give your cat a little milk once in awhile and she’s seem fine, it’s never a good idea to make milk a part of your cat’s diet. It is okay to occasionally indulge your cat but stay alert and look for any changes in her stool.  Remember regardless of what you give her as a cat treat, plain water is what she really needs. Make sure that there is a bowl filled with water available at all times.