Changes

The domestication of the dog by man has ancient origins. The oldest dog fossil remains in a human settlement have been found in a Natufian tomb,<ref>https://www.nature.com/articles/276608a0</ref> and date back to 11,000-12,000 years ago, but it is assumed that the origin of the relationship between the two species lies far behind time, claimed to be between 19,000 and 36,000 years ago.  The study of a skull of "dog-like canine" found in the Altai mountains in Siberia has led to the hypothesis that the various modern dog breeds do not have a single common progenitor, but derive from different distinct processes of domestication of wolves in different areas of the world.<ref>https://www.ncbi.nlm.nih.gov/pubmed/21829526</ref>

The domestication of the dog by man has ancient origins. The oldest dog fossil remains in a human settlement have been found in a Natufian tomb,<ref>https://www.nature.com/articles/276608a0</ref> and date back to 11,000-12,000 years ago, but it is assumed that the origin of the relationship between the two species lies far behind time, claimed to be between 19,000 and 36,000 years ago.  The study of a skull of "dog-like canine" found in the Altai mountains in Siberia has led to the hypothesis that the various modern dog breeds do not have a single common progenitor, but derive from different distinct processes of domestication of wolves in different areas of the world.<ref>https://www.ncbi.nlm.nih.gov/pubmed/21829526</ref>

In 2012 a “best guess” estimate of the world-wide population of dogs was 525 million.<ref>https://www.psychologytoday.com/us/blog/canine-corner/201209/how-many-dogs-are-there-in-the-world</ref>

In 2012 a “best guess” estimate of the worldwide population of dogs was 525 million.<ref>https://www.psychologytoday.com/us/blog/canine-corner/201209/how-many-dogs-are-there-in-the-world</ref>

==Etymology==

==Etymology==