Narrated Ibn Mughaffal:

The Messenger of Allah (ﷺ) ordered the killing of the dogs, and then said: Why are they (people) after them (dogs)? and then granted permission (to keep) for hunting and for (the security) of the herd, and said : When the dog licks the utensil wash it seven times, and rub it with earth the eighth time.

Abu Dawud said : Ibn Mughaffal narrated in a similar way.

حَدَّثَنَا أَحْمَدُ بْنُ مُحَمَّدِ بْنِ حَنْبَلٍ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ شُعْبَةَ، حَدَّثَنَا أَبُو التَّيَّاحِ، عَنْ مُطَرِّفٍ، عَنِ ابْنِ مُغَفَّلٍ، أَنَّ رَسُولَ اللَّهِ ﷺ أَمَرَ بِقَتْلِ الْكِلاَبِ ثُمَّ قَالَ " مَا لَهُمْ وَلَهَا " . فَرَخَّصَ فِي كَلْبِ الصَّيْدِ وَفِي كَلْبِ الْغَنَمِ وَقَالَ " إِذَا وَلَغَ الْكَلْبُ فِي الإِنَاءِ فَاغْسِلُوهُ سَبْعَ مِرَارٍ وَالثَّامِنَةُ عَفِّرُوهُ بِالتُّرَابِ " . قَالَ أَبُو دَاوُدَ وَهَكَذَا قَالَ ابْنُ مُغَفَّلٍ .