Kong wobbler kong wobblernbspnbspprevents harmful gulping and helps the dog learn that moving the wobbler causes the treats to fallalthough the unpredicable movement keeps the dog guessingthe kong wobbler is both toy and feeder that will prolong feeding time whilst giving the dog that mental challenge they neednbspdishwasher safetop screws off from bottom for easy fittingtwo sizes available small and large