When she came into rescue she had evidence of multiple litters of puppies. She's not purebred, there's a little flat coated retriever in her from her head shape and her fur. Probably bred with a purebred lab with the puppies passed off as pure but no papers with a good retriever linage. She has a great stance and point. As soon as she got old and heartworm positive she was dumped at a high kill shelter. I don't think she was "puppy mill" as she was quite socialized but she'd had probably borne several litters to make someone some money, Getting her spayed was first thing. The scar did not grow fur back but she thrived and recovered from the often scary heartworm treatment.
At that point she was a permanent part of our family and couches in two homes.
I think she's comfortable where she is.