Oh no it isn’t. :nono:
All the different breeds of domestic dogs were “evolved” artificially by humans. Dingos are closely related genetically to domestic dogs and probably were domesticated at some point.
Yes that was the point, they can produce offspring but unlike dogs they are too different genetically to produce viable offspring that can reproduce themselves. Dogs only have breeds but Equidae also have species.

lain:
Geneticists will tell you that we humans originated in Africa, and that the human population spread out around the world in a number of traceable routes. It is no coincidence that North American Indians look rather similar to Mongols because that was where they are thought to have come from.
Science doesn’t do “proof” TL, theories simply never get proven, they either remain as the best explanation of the evidence or the evidence will sooner or later falsify them if they are wrong. They don't simply go out of fashion either.
Darwin’s theory has lasted over 150 years, like other theories it will never be proven, but in the opinion of virtually all natural scientists today it will never be falsified either, because they regard it as fact.