Allperpet C Cleanses The Hair Of The Common Cat Allergen Fel D1 And Dander. Both Of These Antigens Are Considered To Be Prime Causes Of Allergic Reactions To Cats. The Fel D1 Is Deposited On The Hair During The Self Cleaning Process, The Dander During Th Normal Epidermal Turnover. Best Used After A Grooming Or Comb Out Of The Coat.