Mishkat al-Masabih 20 Game and Animals Which May Be Slaughtered كتاب الصيد والذبائح 34

عَنِ ابْنِ عُمَرَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «مَنِ اقْتَنَى كَلْبًا إِلَّا كَلْبَ مَاشِيَةٍ أَوْ ضَارٍ نَقَصَ مِنْ عَمَلِهِ كُلَّ يَوْمٍ قِيرَاطَانِ»

Ibn ‘Umar reported God’s messenger as saying, “If anyone acquires a dog, except a sheepdog or one trained for hunting, two qirats will be deducted from his good deeds daily.” (Bukhari and Muslim.)