The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

A 39-year-old woman, a patient in a psychiatric clinic had locked herself in a toilet with a knife. Police brought the dog Purzel when they learned the woman was a dog lover. As soon as the woman spotted Purzel sniffing through a crack in the door she dropped the knife and picked him up.
Hero dog （） a suicide.