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Top Five Pet Allergy Culprits Is your dog itching and scratching? He could have an allergy. Veterinary dermatologist John Angus says that somewhere between 95 and 98 percent of cases will fall into five categories:

  1. Atopy, an allergic reaction to normal environmental proteins, such as pollen
  2. Food allergy
  3. Parasite hypersensitivity
  4. Yeast infection, such as Malassezia dermatitis
  5. Bacterial infections, such as staphylococcal pyoderma