WELCOME TO THE FORUM!!
My apologies in advance for my first post being a negative one ..........but a puppy mill? We do not in any way, shape or form agree with puppy mills here at this forum.
I guess the best way for you to figure out why is to research and watch some puppy mill video's.
Especially with a one year old........omGOSH ........you will have no idea what you are getting at a puppy mill!
PLEASE do your research and find an established and respected breeder.