The Gnawt-a-Rock is made with natural latex rubber, with a faceted, gum-massaging surface. Its irregular shape creates an erratic bounce, and it has a treat-dispensing design for interactive play and reward. Part of the Pacific Gnaw-west toy collection inspired by Ruffwear’s home of Bend, Oregon, and its natural surroundings. Diameter: 4.5 (in), 11.5 (cm), Holds up to 2 cups of kibble. Erratic bounce for engaging fetch Faceted surface for gum-massaging Size suitable for large-mouthed dogs Made from natural rubber, a renewable, sustainable resource