Kaiser, in his younger days, when given a rawhide bone, wouldn't eat it, and would take it outside and bury it in the garden. He would dig them up later, when they were soft and mushy, and bring them in the house to eat. This behavior changed, when the 2nd dog came along. This burying became a game between my husband and Kaiser. While Kaiser was out burying the rawhide, my husband would go to the door, and watch him. When Kaiser discovered that he was being watched, he'd retrieve the rawhide, wander the yard, and only when he was sure he wasn't being watched would he rebury the bone. Kaiser always knew where he buryied the bone, as I neer ever found one when I tilled, or harvested the garden.
My younger boy, Gator, stashed his toys all over the house, and yard. His favorite is tennis balls, which he has stragetically places in the house and yard, just in case a game of fetch breaks out. He also places toys under the covers of our bed. One night, I found a tennis ball, a furry toy and a bone, all in the bed.