That's probably one of the silliest things I've ever read about the domestication of wolves. The leading theory about wolf domestication is that as human waste became larger and larger, wolves came more and more into contact with humans, as they scavenged the waste. Wolves who were less agressive / easily spookable, could stay near the waste while the more agressive / spookable would fight or flee. Those wolves that could stand their ground around humans had a lower adrenal response. Studies have been done on foxes that show that only a few generations of breeding amongst lower adrenal foxes can produce a more and more domesticated fox. I'll even toss a
link your way about it.