my son in law has a cutie pie Yorkie. She was in the yard the other day and saw a squirrel. Being the Big Dog, she chased it into the woods, the squirrel turned around and chased her and back and forth they went - the squirrel was just playing, I think, but Little Bit was really serious. She weighs 3 1/2 lbs. (she bunks with my Miss Sally Sue - 70 lbs.)