Tonka Rubber Tread Tire Dog Toy. Tire out your energetic pup with this Tonka tough toy. This toy is built with flexible rubber to withstand many rounds of play, and has a raised tread design for an easy grip. With an open inside rim design, you can hide your dog's favourite treats inside for extended playtime. Tire tread design make for an easy grip and also massage the dog's teeth and gums for a healthy mouth Made of tough flexible lightweight rubber Weather & water resistant Open inside rim lets you put peanut butter or treats inside Available Sizes: Small: 9cm diameter x 3.5cm width (3"x 1.2") Medium: 13cm diameter x 4cm width (5"x 1.5")