Healthy skin and a normal hair coat are the result of many internal and external factors. When dogs and cats have allergies, they don’t have the same respiratory signs that people do; instead, the allergies affect their skin. The damage that can be done to the skin by the allergies and the pet’s response to what’s happening with their skin. Pets tend to lick, chew, and scratch in response to allergies and can cause more damage to themselves than the allergies alone. Sometimes the reason pets itch have nothing to do with allergies, and stem from conditions such as Cushing’s disease.