Challenge your dog! The Karlie Doggy Brain Train 2-in-1 Dog Intelligence Toy stimulates your dog to use its head and put its brain to work in order to get to the treat. Boost their intellectual performance through play and prevent the onset of boredom. With this cool soft wooden dog toy, you can enjoy two games in one. In the "sachet game", you hide tests under the game pieces and your dog has to find them. The "slider game" on the other hand work with the use of sliding pieces. Your dog has to slide them to and fro to open up the round wooden holes to get to the treats. Playing with the Karlie Doggy Brain Train 2-in-1 Dog Intelligence Toy requires no prior knowledge on the part of your dog. Any dog can play along and increase their intellectual performance through play. Your pet is just to be highly motivated and to want to dive right in! Toy dimensions: Diameter 25cm: suitable for small to medium-sized dogs; depth: D 1.4 x diameter 3.5 cm Diameter 32cm: suitable for medium to large dogs; depth: D 1.3 x diameter 4.5 cm Karlie Doggy Brain Train 2-in-1 Dog Intelligence Toy: Why not try this dog toy with some delicious Chewies Bone Treats? Please note: As with any other product, please supervise your pet with this toy. Check the product regularly for damage and replace the toy if it is damaged or missing any pieces to avoid potential injury to your pet.