Take another look at the sentence:
Swerving to miss a squirrel in the street, Harold's car hit a fire hydrant,
which crumpled his hood.
Swerving to miss a squirrel in the street, a participle phrase, comes right before car, an illogical target. [Harold's, a possessive noun, functions as an adjective describing car.] The people behind the wheel, not vehicles themselves, can swerve to keep the squirrels safe! Before you continue, review the rules for misplaced and dangling modifiers.
Go back to the sentence to try again.