Named in honor of genius Leonardo da Vinci, Leo marks a renaissance in dog toy design! On its own Leo is a great bouncing, fetching, tugging and challenging treat-dispensing toy. You can also link multiple Leo toys together! When the toys are connected, the treats inside can move from one toy to another. Design puzzles specifically for your dog's individual problem-solving level. Completely hollow, and made from a durable and irresistibly chewy space-age material, Leo is loads of fun. Large, medium, and small dogs love playing with Leo! Leo now comes in "Regular" for medium to soft chewers, and "Extra" for medium+ chewers. We also now have the new Mini Leo, for tiny dogs - 15 lbs. and under.