Burying the bone again

Tug did the "bury the bone" thing the other day. It's only the second time we've seen it. He went from one cushion on the floor to another "digging" frantically with his front paws while holding the treat in his mouth. He's put it down and use his little nose to try and nudge the fabric over the treat. When it didn't work in two different places he just took the treat to the middle of the rug and ate it- but he did't enjoy it! He had his head hanging down and his ears were back like it was just something he had to do and get it over with...what a strange little creature...