Some cats are lactose intolerant. And when they consume milk or other types of dairy products, they can suffer from vomiting and/or diarrhea. Lactose intolerant cats lack the enzyme lactase that is important in the digestion of a sugar that is present in milk called lactose. Lactase production in very young kittens is still very efficient which explains why they don’t suffer from digestive upsets when feeding on their mother’s milk. Production of the enzyme tend to diminish after the kittens have been weaned. Some cats that are lactose intolerant may develop a rash after milk consumption. Fortunately, not all cats develop a hypersensitive reaction to milk and are able to consume small amounts. Most milk preparations for cats that are commercially available are lactose-free formulas. It is recommended that you consult your veterinarian Pickerington, OH before making any changes in your pet’s dietary regimen.