I have enquired about an adult Chi/Yorkie mix. I asked if she was housetrained and they said she is not reliable. She is 2.5 years old. My question is this: Do you think it is easier to house train a puppy or an adult. Obviously the adult has got into bad habits and may be difficult to deter. Also, Chis and Yorkies can be difficult to housebreak. Any ideas? By the way, Hi and I love this forum.