"The Messenger of Allah (ﷺ) ordered killing dogs, except for the hunting dog, or the dog that guards livestock." It was said to him: "Abu Hurairah would say: 'or a farm dog' so he (Ibn 'Umar) said: "Abu Hurairah had a farm."
Jami` at-Tirmidhi Book 18, Hadith 30
← Previous Hadith That the Messenger of Allah (ﷺ) said: "Whoever keeps a dog" - or: "acquires a dog" - "neither of hunting nor to guard livestock, then two Qirat are deducted from his reward, daily."

Jami` at-Tirmidhi Book 18, Hadith 29 Next Hadith → "I was one of those who held up the branches from the tree away from the face of the Messenger of Allah (ﷺ) while he was delivering the Khutbah saying: 'If it were not that dogs were a nation among nations, then I would order that they be killed. So kill every one among them that is all black. There is one inhabiting a home in which they keep a dog but their deeds are decreased by one Qirat every day - except for a hunting dog, or a farm dog, or a sheep dog.'"

Jami` at-Tirmidhi Book 18, Hadith 31