مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 514
Purification
The Cleansing of Impurities - Section 3
وَعَنِ ابْنِ عُمَرَ قَالَ: كَانَتِ الْكِلَابُ تُقْبِلُ وَتُدْبِرُ فِي الْمَسْجِدِ فِي زَمَانِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَلَمْ يَكُونُوا يَرُشُّونَ شَيْئا من ذَلِك. رَوَاهُ البُخَارِيّ
Ibn ‘Umar said that the dogs used to go here and there in the mosque in the time of God’s messenger and that they did not sprinkle any place where they had been. Bukhari transmitted it.
Mishkat al-Masabih, 514صَحِيح (الألباني)