My mind immediately went to Congenital Analgia but I can't find anywhere on the Internet that explains if it is exclusively to humans or if it can be in other species. I'm sure that if there are animals in the wild that had CIPA, they wouldn't survive long. I know the brain differs from most animals and humans, but the majority of it is the same, so, other then that, I can't think of a reason why other creatures couldn't have it.
So, I ask you, does anyone know if it's possible for creatures other then humans to have Congenital Analgia?
In advance, I'm sorry if this is against the rules. If it is, let me know and I'll take it down.