PetMatrix offers SmartBones rawhide-free Chews, including PlayTime Chews, DoubleTime Chews and Functional Chews. The products are made with chicken, vegetables and other healthy ingredients, according to the company, and are fortified with vitamins and minerals. PlayTime Chews are rawhide-free ball-shaped chews with crunchy surprise treats inside, and are sold in chicken and peanut butter flavors. DoubleTime Chews have a long-lasting chew center made from chicken, vegetables and rice, and are available in both bone and roll shapes. Functional Chews are available in three formulas: Hip & Joint with Glucosamine and Chondroitin, Skin & Coat with Omega-3 and Omega-6 vitamins, and Calming Care with Chamomile and Lavender.