which sentence contains a metaphor?

The booming sound of thunder filled the air.
She slowly studied the lithering snake.
A bear of a dog came walking down the street.
He ran like a cheetah down the field.

1 answer

The sentence that contains a metaphor is: "A bear of a dog came walking down the street." In this sentence, the word "bear" is used metaphorically to describe the dog, suggesting it is large or strong.