Allergies

Pets that scratch excessively may be allergic to something. Some pets are affected at certain times of the year, while others have problems only occasionally or even continually. Pets may be allergic to such things as flea bites, pollen, molds, grasses, trees, wool, tobacco smoke, certain foods, and even other pets. Regardless of the offending agent (allergen), the main signs are scratching and chewing the skin, which may results in extensive skin damage. The damaged skin is then highly susceptible to bacterial infection.
Important Point in Treatment
The best treatment is to determine the cause of the allergy and avoid it. As this is not always possible, various control measures are taken to relieve the itching and allow your pet to live comfortably.