(PKB Animal Health) Zymox Enzymatic Shampoo was developed for pets experiencing minor bacterial and fungal skin infections. The first line of defense against infectious microbes is the skin. Zymox Shampoo uses the most gentle, non-drying cleaning agents available. It is made from only the mildest plant surfactants with protein based enzymes. Zymox contains three enzymes to attack skin-irritating microbes.