Den raiding wolf puppies for food and material has been a very common aboriginal practice for ages worldwide.
The date around 14k years ago suggested they were flash frozen with undigested food in their guts by the same disaster(s) written about by Firestone, et al. (time for the book, SC) There were probably more than one strike on the Northern Hemisphere by space rocks around that time. There have been numerous reports of flash frozen Siberian Mammoths, who were not snuggling away in dens.
I suspect humans were already tolerating having wolves lurk around their encampments to dine on large kill remnants. It was in the wolves interest to not kill the humans as they were providing large prey for extended mealtimes. With undigested plants in their stomachs (from eating animal intestines?) the disaster that froze them must have happened during the growing season. During the growing season, hungry bears were wandering about, and probably also attracted to large chunks of killed meat. Wolves would have made noise about this which would have alerted the humans to bear danger, and quick action to protect and/or preserve their camp and food. Thus a perfect case of mutual protection.
Eventually, some young wolves would have become pets and the slow domestication and genetic changes begun. In recent Russian experiments with domesticating foxes, it was proved that it took fewer than 10 generations to produce a domesticated fox, with physical and color changes which sometimes echoed those of dogs from wolves. When my husband saw these modified foxes, he said, “Gee, I want one of those!”
These foxes were converted in ONE human lifetime. All that was required was choosing only the most mild and friendly foxes to continue breeding.
SC: Perhaps in your vast store of links you have a few on this subject.