Soap-free and hypo-allergenic, this ultra-mild shampoo is designed to clean brilliantly and leave topical flea control products intact. The addition of aloe vera helps to soothe skin allergies and sensitivities. Soap-free and hypo-allergenic, this ultra-mild shampoo is designed to clean brilliantly and leave topical flea control products intact. The addition of aloe vera helps to soothe skin allergies and sensitivities.