Flea allergy most commonly involves the area surrounding the base of the tail.
Allergic skin disease occurs when the body s immune system over-reacts to some offending substance. Thus, an animal who is only slightly allergic to house dust and to the pollen of a Spring-blooming plant may manifest allergic skin disease only in the Spring when both allergens occur, raising the immune system s response over the threshold at which clinical signs are seen. Since allergy may be inherited, affected animals should not be bred. Contact dermatitis is best treated by eliminating the causative substance from the pet s environment, if possible. While pollen allergies typically begin with a seasonal pattern, after several years the skin disease may persist year 'round in severely affected animals.