@Aloethere
I saw the most gorgeous Basset Hound on my walk this morning it made a nice change to all of the crusty-eyed little white dogs that everyone has.
Basset hounds have lots of health issues just like many other purebred breeds. Lots of skin and ear problems, and back problems. All due to exaggeration of the characteristic features of the dog.
This is one of the reasons a lot of people moved away from purebred dogs. They were told for years that casual and accidental litters were a no-no, which includes most mutts with three or more breeds in the background or parentage unknown.
Then they see that flat faced dogs have problems, long backed dogs have problems, dogs with loose skin have problems, cavalier spaniels die early of heart failure and too-small brains that are excruciatingly painful, German shepherds have back and hip issues, Great Danes and Newfoundland dogs die early of heart failure, and even plain old labs have become prone to allergies and need special (expensive) food, plus many other examples.
So they are also pretty suspicious of the claim that purebred dogs from supposedly responsible breeders are the best bet.
Cross-breeds have kind of filled in the gap, and aren't entirely a great solution - too many of the same problems as purebreds. But at least people have broken away from this idea that the best pet dogs will be purebreds.