Take another look at the sentence:
During a commercial break, Rodney let the dog in from the rain, which was
whining in a pitiful manner.
Which was whining in a pitiful manner, an adjective clause, comes right after rain, an illogical target. It's the poor, wet dog, not the rain, crying to come in! Before you continue, review the rules for misplaced and dangling modifiers.
Go back to the sentence to try again.