حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم أَمَرَ بِقَتْلِ الْكِلاَبِ ‏.‏

Abu Huraira (Allah be pleased with him) reported Allah's Messenger (ﷺ) as saying

He who kept a dog would lose out of his deeds equal to one qirat every day. except (one kept) for watching the field or herd.