My Benji does this all the time. If we give him a treat, it could be the tiniest thing like a piece of popcorn, and he usually goes to his cage to eat it. With his food he'll bring one piece of food he likes (the beef chunks from his Purina Beneful food) and eat it away from his bowl. He'll do this every so often while eating his food. I put some canned food in for the first time today and I don't think he did that. This behaviour doesn't bother me though. It's quite funny to watch actually.