ذِكْرُ الْبَيَانِ بِأَنَّ هَذِهِ الْأَشْيَاءَ الثَّلَاثَةَ إِنَّمَا تَقْطَعُ صَلَاةَ الْمُصَلِّي إِذَا لَمْ يَكُنْ قُدَّامَهُ سُتْرَةٌ
Abu Dharr said (and not the Prophet): If there is not anything like the back of a saddle in front of a man who is praying, then a donkey, a black dog, and a woman cut off his prayer. I asked him: Why has the black dog been specified, distinguishing it from a red, a yellow and a white dog? He replied: My nephew, I also asked the Messenger of Allah ﷺ the same question as you asked me. He said: The black dog is a devil. (Using translation from Abū Dāʾūd 702)
قَالَ رَسُولُ اللَّهِ ﷺ «إِذَا لَمْ يَكُنْ بَيْنَ يَدَيْهِ مِثْلُ آخِرَةِ الرَّحْلِ فَإِنَّهُ يَقْطَعُ صَلَاتَهُ الْمَرْأَةُ وَالْحِمَارُ وَالْكَلْبُ الْأَسْوَدِ» قَالَ قُلْتُ يَا أَبَا ذَرٍّ فَمَا بَالُ الْكَلْبِ الْأَسْوَدِ مِنَ الْكَلْبِ الْأَحْمَرِ مِنَ الْكَلْبِ الْأَصْفَرِ؟ قَالَ يَا ابْنَ أَخِي إِنِّي سَأَلْتُ رَسُولَ اللَّهِ ﷺ عَمَّا سَأَلْتَنِي عَنْهُ فَقَالَ «الْكَلْبُ الْأَسْوَدُ شَيْطَانٌ»