Come up beside and bark? Maybe you should have answered in a language he'd understand.

Turn and give him your best Alpha ***** growl/bark. Or any of the other anti-dog suggestions we bandy about - including pepper spray.

But, honestly, officer, I thought it was a dog barking at me, and I'm terrified of dogs! {fluttering eyelashes} /dumb blonde

OK, probably not the best response, but I'd be really tempted.