Just as with some people, the casein protein in cows milk can be difficult for cats to digest, but if your cats are able to drink cow's milk and it doesn't upset their GI tract and they seem to like it, giving them a small amount should not present a huge problem. But keep in mind that the biological function of cow's milk is turn a calf into a cow, which means putting several hundred pounds on the animal in its first six months of life and it's chock full of natural growth hormones, fat, protein and other food factors to accomplish that. In both cats and dogs, this overabundance of protein can react badly with proteins in their bodies and bring on allergies or asthma. A better choice would be goat's milk or soy milk. There are other and better sources of Vit. D, as well. According to Dr. Martin Goldstein, it is advisable to strike milk from a cats's diet altogether..."My cats almost never get milk. They don't seem to miss it, and I think they are fitter and healthier for not having it at all." (The Nature of Animal Healing, pg. 70)
Sally in San Jose