Okay, so the puny humans have run away, except for the Matched Set Children (who fainted due to fright) and the dog, who decided to keep barking at the Yeti. This attracts the Yeti, further scaring the children, but he decides that these tiny people are friends and also that he should pick them up.
This causes the other puny humans to run away, and the dog to run away in another direction. The Yeti decides to follow the dog because dogs are cool, carrying the children.