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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.
Less common insect-related itching. Scabies (which is diagnosed with a skin biopsy), head and pubic lice (crabs), bedbug bites (mostly on the torso), and flea bites (usually below the knees of dog owners) all cause severe itching. Each requires a specific eradication technique.