The BIONIC Treat Shaker Toughest Chewer Treat-Dispensing Rubber Dog Toy is a heavy-duty interactive toy for big dogs that combines the challenge of a puzzle with the durability of a chew toy. Fill this large Bionic Treat Shaker with your dog’s favorite treats and watch as they nudge and paw at its tough rubber shell to earn their reward. Its dynamic shape causes unpredictable movement to keep large dogs engaged, and the ultra-strong, BPA-free material holds up to intense chewing for long-lasting fun and enrichment.