Few animals elicit more adoration than puppies and miniature dogs, but a dark side exists in today’s designer dogs, the cross breeding of two purebred dogs, where health problems, shortened life spans, and vulnerability to disease may impact the family pet. In the past few decades, Franken dogs like Cockapoos (a Cocker Spaniel and a Poodle), and the giant Schnoodle (a Schnauzer and a Poodle) have danced into hearts around the world, often leaving families with big vet bills, and intense...