Lady does that ALL the time and I think its cute until I sit on the couch and find kibble behind the cushion!! lol.She hides it everywhere! In our shoes,under the couch,in her bedding..etc,its everywhere!
We had to stop giving her soft food in the living room because of that because its ok to find a peice of dry kibble,but finding a chunk of canned food squished in my shoe stopped being funny

Now we feed her the soft food in the kitchen and watch her.
She also tries to burry kibble in the middle of the living room floor! THAT is funny because she pushes the floor with her nose as if covering the kibble,then she digs and digs and walks away as if saying "there..no one will find that there!" lol
These yorkies are such goofballs some times!