Dogs use their wits, paws and noses to find the treats you hide inside these clever wooden activity toys designed by Nina Ottosson. Level 1 Dog Brick features a grid of interlocking sliding blocks your dog must move to uncover the treats. For even more of a challenge, Level 2 Dog Tornado features four layered discs that rotate to reveal the hidden rewards, and Level 2 Dog Twister requires your dog to locate the treats by moving interlocked segments around a circular puzzle. Great interactive fun for dogs and their people! Brick: 167/8 x 101/2. Tornado: 10 diam. Twister: 18 diam.