The Seasons of Dr. Dog Pet Mart Allergies Humans with allergies usually react by sneezing, but your pet reacts by scratching. Both you and your pet are reacting to an allergen, which is a substance that causes irritation.
Most allergens irritate from inhalation, but few are contact types, such as an allergy to wool.
Some allergens are found in food, most commonly corn, wheat, soy, beef, and dairy products. The first signs of allergic reactions are scratching, licking, biting, or rubbing the skin. This can lead to infection characterized by red bumps and pimples. Because of the discomfort, it is important to get professional help as soon as possible.