Well, we could also look at that and say that he got Twilight Sparkle's love of knowledge, like Starfleet, with Rainbow Dash's rebellious attitude, like Kirk, and Rarity's prissiness, like Picard. All that and it made the Star Trek logo to boot. Truly this test is psychic
I'm not it counts if they're anthros. That's basically just normal furry stuff. And anyway, a cross species germ mutation from a horse or a goat or something to humans is very unlikely. You're more likely to get kicked in the head and get a concussion.
No really that is how people got herpes and gonorrhea to begin with and why we haven't wiped them out yet. If people stopped having sex with animals we could stop herpes from spreading...
I mean really, goats and horses are safer than girls, if you look at cold hard numbers. The number of STDs transmitted between two humans is way higher than interspecies sex. That's just science.