وَحَدَّثَنِي مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ مَنِ اقْتَنَى كَلْبًا إِلاَّ كَلْبًا ضَارِيًا أَوْ كَلْبَ مَاشِيَةٍ نَقَصَ مِنْ عَمَلِهِ كُلَّ يَوْمٍ قِيرَاطَانِ ‏"‏ ‏.‏

Malik related to me from Nafi from Abdullah ibn Umar that theMessenger of Allah, may Allah bless him and grant him peace, said,"Whoever acquires a dog other than a sheepdog or hunting dog, willhave two qirats deducted from the reward of his good actions everyday." Translation Not Available

Book Ref: Muwatta Imam Malik Book 54 Hadith 1778
Web Ref:  Muwatta Imam Malik Book 54 Hadith 13