"The Messenger of Allah (ﷺ) commanded that dogs be killed. He said: 'What do they have to do with dogs?' And he granted a concession regarding hunting dogs and sheepdogs. And he said: 'If a dog licks a vessel, wash it seven times, and rub it the eighth time with dust.' Abu Hurairah differed from him and said: 'Rub it one time with dust.'"
Sunan an-Nasa'i Book 2, Hadith 13