Contact allergies are seen mostly on the hairless areas of the abdomen and on the bottoms of the feet. The dog's case history helps with the diagnosis. The intense itching and location of the lesions are also helpful in diagnosing the type of allergy present. Trials of special hypoallergenic diets are used to diagnose food allergy. Allergy testing is used to help choose immunotherapy.
Blood tests are also available to diagnose allergies, but their use is more controversial.
Ask your veterinarian for his or her current recommendations. Antihistamines and corticosteroids may be used by your veterinarian to give your dog relief from the intense itching. In most cases this will stop the self-mutilation. The owner will be instructed to give corticosteroid tablets in decreasing dosages for a few months. Corticosteroids are potent drugs and should not be used carelessly or for long periods of time.