Breeders today face more zoning ordinances caused by increased human population pressures. (americanshihtzuclub.org)
A combination of increasing human population density, better hunting methods and climate change may have reduced the availability of prey and pushed some wolves towards scavenging, which favoured tameness and smaller size. (newscientist.com)
However, given the low dose used in the study we can not rule out that, with increasing human population and medical use, this might become a problem in the near future» says Gustav Hellström. (sciencedaily.com)