This unique, interactive toy is designed to challenge as well as entertain! They work in reverse of regular puzzles; dogs take toys out, you put them back in. The puzzles exercise a dogs natural instinct to search, stalk and capture its prey, as well as strengthening eye-paw coordination skills. Toy inserts can be replaced over and over again for endless entertainment and fun! Dogs will have hours of fun while sharpening their cognitive skills at the same time. Durable design and craftsmanship ensures long-lasting puzzle-solving fun!