Out of interest, (I am NOT looking for another dog, honest) I looked at the manytears website. What an eye opener. I had no idea there were so many breeding bitches who are cruelly discarded once their fertility wanes or they develop health problems. The poor things have never lived in a house with a family or other pets and have no idea how to socialise. 
I used to breed Jack Russells when we lived in a large farmhouse. The bitch, puppies, and other pets all lived in the utility area at the back but they were treated as part of the family at all times. When we downsized our present terrier, Millie had a litter as the family wanted her puppies. We also kept her daughter, Peggy. Never again! It was far too much work in a small space and as a result they have both been spayed.