Petface Duo-Chew Peanut Butter Flavour. Keep your pooch entertained with the Petface Duo-Chew Peanut Butter Flavour. Presenting the perfect chew toy, the Duo-Chew features a nylon shaped bone with added nodules to help massage and clean the teeth and gums for a healthy mouth. Flavoured with peanut butter, the Duo-Chew will be irresistible. * Pets should be supervised whilst playing with toys. Although Petface toys have been designed to be strong they are not indestructible and will be susceptible to chew damage. The life of a Petface toy depends on the ability and strength of your pet. Monitor for wear and replace if damaged*