A very interesting read and I agree. Mutts I have owned I hardly ever had to take them to the vet, well not as often as pure bred dogs.
I think a lot of problems stem from breeders not health testing their breeding stock and when looking for new sires or females as a breeder over the years the amount of breeders you approach who never tested their dogs definitely outweighed the ones who did.
This used to limit you to few choices and I for one am glad of the internet where information and proof of testing is readily available now at the click of a button.
Yes people can falsely doctor documents but with homework on your breed of choice, you should be checking all claims before purchasing and hopefully with doing that you are less likely to encounter the problems so many seem to endure.