Talk:1706: Genetic Testing
Regarding the title text, elbow dysplasia is something that genetic testing might find a susceptibility to in dogs, but parvo (canine parvovirus) is a viral infection and heartworms and mange are both parasites. I'm only beginning my veterinary studies so it's possible I'm speaking in ignorance but I've never heard of any genetic factors that make one dog more or less susceptible to any of the latter three than another dog. Generally speaking, all dog owners are advised to get their dogs vaccinated against parvo and kept on a heartworm preventive treatment such as ivermectin (Heartgard and other brands). Ie., these are blanket prevention strategies recommended for all dogs and no attempt is typically made to ascertain susceptibility level before recommending these treatments.
Of course, Randall is writing a comic intended for mass consumption and it's possible he wanted to include some canine ailments that would be more commonly recognized rather than just strictly listing congenital ailments of dogs like entropion or brachycephalic syndrome, which might have caused confusion and ruined the joke. --(I don't have an account yet)