Cookie, my Chihuahua is like that also, she drove my old Poodles nuts until their health declined and I had to have them put down. We were her 2nd or 3rd home, I don't think anyone tried teaching her anything. I would like to get another dog but, she would take over, she is going on 5, doubt I will outlive her so I can get a breed I like better. My Husband has really taken to her.