That the Messenger of Allah (ﷺ) said: "Whoever acquires a dog - with the exception of a dog to guard livestock, a hunting dog, or a farm dog - each day a Qirat is deducted from his reward."
Jami` at-Tirmidhi Book 18, Hadith 32
← Previous 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 Next Hadith → "I said: 'O Messenger of Allah! We expect to meet the enemy tomorrow and we have no knives.' So the Prophet (ﷺ) said: 'As long as it causes blood to flow, and Allah's Name has been mentioned over it, then eat it, provided that it was not done with a tooth or nail. And I will tell you why: As for the tooth it is a bone, and as for the nail it is the knife of the Ethiopians.'"

Jami` at-Tirmidhi Book 18, Hadith 33