Messenger of Allah ﷺ 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."
قَالَ رَسُولُ اللَّهِ ﷺ «مَنْ أَمْسَكَ كَلْبًا فَإِنَّهُ يَنْقُصُ كُلَّ يَوْمٍ مِنْ عَمَلِهِ قِيرَاطٌ إِلاَّ كَلْبَ حَرْثٍ أَوْ مَاشِيَةٍ۔»