>Why does this idea insist on continuing surely it is pot luck with regard to how healthy a mongrel is I cant >imagine anyone health testing mongrel parents
Well a certain RSPCA Vet can't have helped with
that particular myth - citing hybrid vigour etc ;) and ignoring the fact that two dogs of different breeds aren't different species ;)
As for health testing mongrel parents, I very much doubt that there are any figures kept for mongrel health ;)
My own mongrel cross breed (Parson Russel Type bitch and Afghan Father - total accident

) was the most expensive 'free to a good home' dog I have
ever known - he cost far more in vets bills than all the pedigree dogs my whole family has ever owned put together :(
Even our rescue pedigrees have been strangers to the vets (apart from vaccs)