Scientific data about dog breeds in the LA Times today.
Yes, there are diseases that are particular to this and every other breed but there are a lot more good qualities that can be bred right out of them.
http://www.latimes.com/news/local/la...home-headlines
"There are angry breeds, mean breeds, calm breeds and nice breeds," said Hans Ellegren, a professor of evolutionary biology at Uppsala University in Sweden. "This is now the best possibility we have to map the genes that are involved in these traits."