the Messenger of Allah commanded that dogs be killed, except those which were exempted.
Sunan an-Nasa'i Book 42, Hadith 15
← Previous Hadith "Ibn As-Sabbaq said: "Maimunah told me that Jibril, peace be upon him, said to the Messenger of Allah 'We (Angles) do not enter a house in which there is a dog or a picture, The next day the Messenger of Allah commanded that all dogs be killed, even small dogs."'

Sunan an-Nasa'i Book 42, Hadith 14 Next Hadith → "I heard the Messenger of Allah raise his voice with the command to kill dogs. All dogs were to be killed except dogs used for hunting or herding livestock."

Sunan an-Nasa'i Book 42, Hadith 16