100 years of selective breeding. Sadly, this is why purebred dogs have so many health issues. Just go get a mutt from the shelter! As long as there are homeless animals, there's no such thing as a "reputable" breeder.
"If you ask for a "puppuccino" at Starbucks, they will give you a cup of whipped cream for your dog!" - is it true? I was definitely offered a cup of whipped cream for my dog before at Starbucks lol. I just thought he was special :/