Bukhari :: Book 3 :: Volume 39 :: Hadith 515
Narrated Abu Huraira:
Allah's Apostle said, "Whoever keeps a dog, one Qirat of the reward of his good deeds is deducted daily, unless the dog is used for guarding a farm or cattle." Abu Huraira (in another narration) said from the Prophet, "unless it is used for guarding sheep or farms, or for hunting." Narrated Abu Hazim from Abu Huraira: The Prophet said, "A dog for guarding cattle or for hunting."
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