Interesting Cross Breed on Craigslist

Go Dogs wrote:
I have seen very, elderly lap dogs. I have seen many dogs bred for sports, that were riddled with joint and bone problems.
A happy medium would be nice.

I've seen lots of complaints about dogs bred solely to be pets with significant health issues and dogs bred for work that live to 13+ years of age. None of these examples (yours or mine) are evidence for or against my premise; they are just hearsay. Real data would include the incidence rates of diseases in dogs bred for work vs bred for pets (I'm not talking about breeds developed for work vs pets but the breeding goals of the litters).