[Critter]

we have talked about getting a 3rd yorkie off and on for a while. This weekend we were picking up dog food and we went to a place we normally dont go to and they had a yorkie rescue group there and they had this little girl who honestly I feel in love with. They had several other yorkies but somehow this little girl just pulled me in. she was extremely shy and had the saddest eyes. they came from a puppy mill and lived in terrible conditions. they said they kept them in cages outside and use to spray them with hoses when they got dirty. it seriously broke my heart. they had all been vet checked and had been with this group a while. they appeared to play well with other yorkies. they think she is around 6 years old. None were house trained. She said we would need to treat her like a 8 week old puppy. I am so torn. We bought both our boys as puppies from breeders. What are the pros and cons of getting a dog that you know is from a puppy mill. these dogs need homes too. How hard is it to house break a 6 year old dog? I keep going back and forth. I don't want to make this decision with my heart only. I want to do what is right for her, she has had such a tough life already. I keep saying that us going to this store was a sign we should get her. any suggestions, any advice??