Sometimes puppy mill puppies do great sometimes they dont. You just have to watch out for things like you would normally with any yorkie, puppy mill or not and when you do have normal vet check ups just make sure they do a good all over check. We ended up finding out Callie probably came from a puppy mill after we got her and I learned about them and she as a few things like LP, allergies, skin allergies, and the vet mentioned maybe a little tiny bit or arthritis in her back and shes not the "standard" yorkie shes has floppy ears, weighs 16 pounds, and her tail look like they might have docked it but not the right way because its a little bit longer then a nubby but not quite a full tail, but she seems to have pretty good health besides that. All any of us can do is hope and pray for a long long time with our babies and enjoy the time we have