In this given set of materials, there are discrepancy between the view of the author and the lecturer over the issue of domestication of dogs. With three cogent explanations, the lecturer raises objections to the alleged facts on how, when, and where dogs became tamed.
To start with, the lecturer debunks the author's first conjecture since it is difficult to domesticate wolves due to their aggressive characteristics. To elaborate in detail, the lecturer claims that wolves are likely to chase down preys, therefore it was hard for ancient people to hunt who usually set traps and hid nearby. However, this is in direct opposition to the author's claim that dogs would have been evolved from wolves that were trained by people.
On top of that, the lecturer also indicates dissent over the author's point on when dogs became domesticated. The lecturer sounds convinced since the author is making a manifest error about the time when the dogs became domesticated since the footprints of a dog and a boy found in french cave were at least 26,000 years old, which shows that dog domestication occurred much earlier than the time that the author mentions. The author asserts that people started to domesticate dogs 16,000 years ago.
Thirdly, the lecturer goes to expound the author's idea on where the dogs became domesticated. The lecturer mentions multiple places to corroborate his opinion. He adds that their fossil were scattered around the world such as Europe, North america, and Middle east. Moreover, some evidence indicates that there were four ancestors of current dog species from different locations. This counters the author's theory that people domesticated dogs only in China for the first time and then the dogs were spread to other regions.