Do Pets Have Allergies?
How common are allergies in dogs? Unfortunately, allergies are quite common in dogs of all breeds and backgrounds. Most allergies appear after the pet is six months of age, with the majority of affected dogs over age one or two.
Also, Like humans, cats can be allergic to a variety of substances, both natural and man-made. Common organic cat allergens include foods, grasses, pollens, parasites, mold, and dust