When Angus is driving his father's truck and crashes it into the stack of logs, it results in a partial spill of the logs on the right side of the truck. When they get out of the truck to examine the damage, the entire stack of logs has been knocked over.
While the rescue from the log is in progress the pilot keeps referring to 50 to 70 knot winds making it unsafe to stay and save the dog. It is obvious that the trees and bushes are not moving, indicating there is virtually no wind at all, even high up above the hilltops.
When Angus and Yellow Dog are traversing the log together, a black safety line is visible, moving along the log in front of them.