Fun and Challenging Toy: The textured rubber sprockets and smooth nylon knobs make it tough for your dog to access the treat rings; keeps your dog playing longer Designed for Tough Chewers: Made from durable nylon and rubber, this toy was designed to satisfy strong chewers Treat Rings Included: 4 Busy Buddy rawhide treat rings are included (additional treat rings available separately) Easy to Clean: Top-shelf dishwasher safe Large Dogs: Designed for dogs over 50 pounds U.S.-Based Customer Care: Our pet product experts are here to help you and your pet and are available by phone, email or chat if you have any questions Quality Promise: PetSafe brand has been a trusted global leader in pet behavior, containment and lifestyle innovations since 1998 to help keep your pet healthy, safe and happy