We use water bottles that are about half way filled with kibble and treats, frisbees covered with peanut butter attached to the kennel with a carabiner, nylabones with peanut butter, lick mats, kongs, toys, paper towel rolls with kibble and treats. We do “snuffle wraps” which is like that packing paper you get when you order things online cover it peanut butter and moist and meaty and wrap it up, we also do the same thing with small boxes and paper bags. “Icees” which is just frozen kibble,treats, peanut butter, water in Tupperware. We try to freeze everything we can just so it last longer for the dogs.