What is another explanation of how natural selection produced domesticated dogs?

Answer 1

Technically, I think that the domestication of dogs was a product of both natural and artificial selection. It probably started out naturally, with wolves living in close proximity to humans and scavenging from their waste, gradually becoming adapted to co-existing with human populations. Wolf populations living in close proximity to human settlements might adapt to them in a way similar to what happens with predation: humans would hunt and kill off the more aggressive packs, unwittingly ensuring that the surviving packs would be more timid, more prone to domestication. Then humans began taking wolves into their households, for whatever reason, and training their captive offspring. Though there might not at this point have been conscious efforts to breed gentler wolves, nevertheless at this point we should speak of artificial selection rather than natural selection: misbehaving captive wolves would be killed, the more docile survivors would breed.

But that's just one hypothesis. Most hypotheses will go along the same global lines though.