I have a 9 year old chihuahua who is house trained and she is the only little dog I've ever owned tht won't pee in the house. My 13 year old pom will pee anywhere and everywhere and then some including the bed she sleeps in and it's not going to change with her. My lhasa is house trained and that didn't take him long to learn. However, I've decided to stick with larger dogs because the small ones just don't get it. It's time for a great dane.....