Having said that, people adding new genes in an old breed are generally doing the dogs a favour. Can help to get rid of genetic side effects. I like my mongrels for that reason. Tend to steer away from purebreds and vet bills in one move."Working farm dogs" kept the breed alive, not being bred to look like anything particular but good working dogs. Then interest outside of the region developed and people started breeding "American Bulldogs" with Bullmastiff mixed in to make 'em bigger, etc etc.
A doctor once looked at my name, then my face and asked if I was mixed race. On my affirmative, she launched into a speech about the advantages of the wider gene pool. Turns out Hitler was wrong.
