ALL DEFINITIONSPet AllergyDefinitionPet allergy is an immune system reaction to proteins found in an animal's skin cells, urine, or saliva. It is characterized by symptoms that occur when a person is exposed to allergens from pets, most commonly cats and dogs.Related SpecialistsShowing 3 of 12Mark BianchiMDJunghee Jenny ShinMD, PhDRyan SteeleDOMore Related Specialists