Any intresting ideas for fillers? The most sucessful one i've had so far was mix of bone marrow cookie and hot dog. He went nuts for that one, chewed on it for almost four hours straight. I almost bought the original Kong toy today but i was advised against it by an employee at critter hut. He has the puppy kong and loves it but I've been wondering if anyone has any weird/intresting things they fill their dogs kongs with. Usually peanutbutter works well but lately when we give it to him in the afternoon or evening he'll have an pooing accident overnight in his crate. Has anyone tried liver paste ? I've been eyeing it.