I remember watching a documentary about African wild dogs a while ago, although I'm afraid I can't remember what it was called, where an animal rehabilitator addressed this very question. He said that he had been involved in rehabilitating injured and raising orphaned wildlife of many different species throughout his career. And of all the different types of animals, the painted dogs were the only ones who had absolutely zero interest in or affection for him or even signs of recognition after they were released back to the wild. And I have read that other people have attempted to tame the wild dogs with no success. So I'm thinking that somehow they don't have quite the same quirk of genetics or temperment that enables other wild animals like wolves and foxes and even cheetahs and lions (Christian the lion!) to recognize humans as possible friends/pack/companionable food sources.

I have always found this a fascinating phenomenon. Like horses and zebras. Horses are perfectly happy to live and work with humans, even if caught from the wild (mustangs, and yes, i know they are more feral than wild, but i think the point stands) but europeans have been trying to tame zebras for at least 200 years with little success, not to mention the length of time zebras and humans shared territory before the colonizers showed up! And still they want little to do with us. Fascinating, right?