Sooo, they have no freakin idea what happened to it. lol Nice speculation to whip up a fear frenzy. It was probably like my old neighbor's dumbass little dog who squeezed into my yard and put itself very close to death from my dogs one night. I've noticed a lot of people with little dogs and cats think it's ok to let them run loose.
I can't think of too many diseases they transmit that would kill a domestic dog within 48hours. Not that there isn't that chance, obviously. Perhaps, something like parvo or rabies, but the dogs should've been vaccinated against it. I would really like to know what it was exactly they caught if you get a chance to find out or remember. Anyway, I'm not saying this didn't happen, but there are a few things that seem a little unusual to me. I'm really curious about some details.
Honestly, my biggest concern would be mange mites. Oh, and the occasional breeding if you have a female in heat. Had it happen to a couple different folks I knew when in Texas. Pups tend towards skittish, though.