I realize that you're having fun with this, but for the benefit of others there are diseases like this among dogs. The bitch can be infected relatively harmlessly. If she passes it to the stud dog, he can become infected and eventually sterile, potentially ending his genetic line.
There are also diseases like anthrax among cattle. I could see something like that spreading like wildfire, too.
My theory is they all starved to death..........
Too bad Hillary hasn’t passed anything along to hubby.