If the reaction is seasonal, pollens may be the culprit. The itching may be most severe on feet, flanks, groin and armpits. Dogs may rub their face on the carpet. Ear flaps may become red and hot. Chronic ear infections may follow.
Skin becomes thickened, greasy and has a strong odor.
Hot spots may develop due to irritation from constant chewing or scratching, which is then followed by infection. If a dog has the above symptoms and responds well to the treatment measures outlined below, no further diagnostic tests may be needed. If the problem is severe and does not respond to simple measures, allergy skin testing can be done. A portion of the skin is shaved and a variety of substances are injected into the skin to see if they provoke a reaction. This can be done frequently but provides only temporary relief.