Can anyone help me and tell me how I can get my 21 month old Yorkie (Bella) to stop pooping on he floor and poop on the wee wee pad. I'm so frustrated with her. There are times when she does it on the wee wee pad and she knows but other times she just does it on the floor. She has pooped on her pad while it was wet from pee so that cannot be the reason. Help! So frustrated!