Answer:
His business begins to fail when his patron dies, so he decides to go to sea again and travels for six years. Although he has planned to return home at the end of this time, he decides to accept one last job on a ship called the Antelope.
The answer is: dangling modifier.
Dangling modifiers are separate from the word they modify, resulting in ambiguity, confusion or nonsense. In the example sentence, it is not clear which animal is walking the wire - whether the dog or the squirrel. Supposing the squirrel (which is about to fall) is walking the wire, a correct version of the sentence would be:
My dog waited for the squirrel to fall, which was walking the wire.
