Pet shampoo is a special formulation of shampoo that is designed especially for pets. This shampoo often contains a number of natural ingredients like aloe vera, tea tree oil and the like. They are much gentler than human shampoos. Pet shampoos are designed to keep the skin oil and pH balance so that the dog remains healthy. Pet owners should understand that the needs for pets, however similar to us, cannot be treated with the same shampoos and other products. Therefore, a special brand of pet-care products is needed.