Hello, I have a Chihuahua, female named Chica!You have to be constant in training your Chihuahua.I got Chica to sit or lay down by command and she would do it because I gave her a treat after she did what I asked. I am constantly commanding her to stay and praising her when she listens. I give her a treat also. It just takes time. She is one year and 7 months old.