BUILT FOR MODERATE CHEWERS Our best-selling customizable puzzle and treat toy is designed to be filled with a dog's favorite kibble or treats. Toppl's soft, rounded inner 'teeth' contain a contoured cavity to hold treats in place until your dog nudges them out. To change up the challenge, simply connect the XL and Large or S mall and L arge together . Toppl is the viral, best-selling puzzle toy that doubles as a slow feeder. Its inner teeth holds kibble in place, making mealtime more engaging. Fill with kibble and dog-safe liquids, then freeze for an extra challenging treat. When the slobber builds up–just toss it in the dishwasher! Pair with Toppl Stopper to block Toppl's side hole to keep liquids safely inside.