Oh the genetic confirmation for dingoes to have arrived in Australia is about 8000 years ago these days. So it’s about when did the extra muscles evolve and in which genetic lines? Dingoes and the new guinea singing dog are traced to have come from the wolves domesticated in Asia, so I guess they wouldn’t have them unless they evolved independently or the genes spread before they got separated in Guinea and Australia? But then do japanese breeds also not have them since they’re from the same lines probably? I don’t know, there’s just too little information online. Or if there’s more, I can’t find it