I have a 2 year old lab that is the dearest thing I live with, other than my husband. My lab responds to almost every command except "come". She responds to her name, but when I add come to her name, she lays down and (I think), smiles at me. She has also recently designed a game that when I say "come", she invites me to play, wags away and runs. (Again with that smile). Any suggestions?