^ I think the difference between dogs and snakes, is that man has already modified dogs to the point where most of them are absolutely nothing like their original natural form ....
A much better response then I expected. Those problems you describe also happen quite often in the purebred dogs. According to some vets it is actually more common that purebreds suffer from weak heart/lungs, and have those hip problems over a mixed blood dog. You are correct in as far as a dingo never normally breeding with a wolf, but if the resulting dog has no physical abnormalities and is totally healthy then why should it be a problem? At the end of the day is it that important what blood your animal has so long as it is healthy and a great pet?