When I was still living at home, we had a dog that accidentally became pregnant. We didn`t know she was pregnant, until one day she gave birth to six puppies! While everyone was at school/work, my mother took all but one puppy (a male white dog) to the vet and had all of them put down. There was no way anyone would want a mix breed puppy. The reason that one puppy wasn`t put down was because it was a male (female dogs were not well liked, as the owner had to constantly worry about unwanted pregnancy) and becasue it was white. The assumption was that white dogs were preferred to black dogs. I think I cried my eyes out. It was the saddest day of my life.