" مَنِ اقْتَنَى كَلْبًا نَقَصَ مِنْ أَجْرِهِ كُلَّ يَوْمٍ قِيرَاطَانِ إِلاَّ ضَارِيًا أَوْ صَاحِبَ مَاشِيَةٍ "
It was narrated that Ibn'Umar said: "The Messenger of Allah said: 'whoever keeps a dog, two Qirats will be detracted from his reward each day, except a trained hunting dog, or a dog for herding livestock."