Like humans, dogs and cats can be sensitive to various kinds of allergens—either in the air, in their food, or on their bodies. The most common symptoms which may indicate an allergic reaction in your dog or cat include excessive itching, biting, or licking of their body. In cats, allergies will sometimes lead to respiratory issues. When seeing a pet who is showing symptoms of an allergic reaction, we first try and determine the source or cause of the allergic reaction. There are three different sources of allergens that can harm our pets: allergens in the air, in food, and in fleas. In general, fleas are the easiest of these allergens to treat; some dogs and cats have what is called flea al