Analysis of information sources in references of the Wikipedia article "Dog" in English language version.
[...] current studies seem to suggest [...] dog as predator or scavenger needed a food source and shelter.
New Zealand was originally a land without terrestrial mammals, except for three species of small bats. [...] packs of European dogs were roaming forests by the middle of the 19th century. [...] both domestic and feral dogs continue to be predators of ground birds, including the kiwi and weka [...].
[...] current studies seem to suggest [...] dog as predator or scavenger needed a food source and shelter.