The sphericon 5 in colorful dog toy

Rubber.

Rubber. This hard rubber toy is a multi-tasking item. It works well as a chew toy for the dog, but it can also be a fun interactive toy. When the owner tosses it for the dog to fetch or starts a tugging game with the dog. Discard if ball becomes worn. This toy encourages chewing and gnawing, activities that dogs naturally require.