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Other symptoms include excessive licking or scratching, scabs, and hot spots. Severe flea infestations can cause blood loss and anemia, and even expose your dog to other parasites, such as tapeworms. Treatment may include a topical and/or oral flea killer and a thorough cleaning of the pet's home and yard.
Sometimes, food allergies will lead to an itchy spot around your dogâs anus. 1  Other skin problems, such as skin infections or hyperpigmentation, could develop as a result of your dog licking and/or biting at the itchy spots. 2  Chronic ear infections and digestive upset are common signs of food allergies.oods that commonly trigger allergies in dogs include beef, chicken, wheat, and dairy. 1  The immune response always has a genetic basis, but it has also been suggested that receiving antibiotics early in life could make a dog more prone to developing food allergies.