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Mishkat al-Masabih 3869
وَعَنْهُ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم يكرَهُ الشَّكالَ فِي الْخَيْلِ وَالشِّكَالُ: أَنْ يَكُونَ الْفَرَسُ فِي رِجْلِهِ الْيُمْنَى بَيَاضٌ وَفِي يَدِهِ الْيُسْرَى أَوْ فِي يدِه اليُمنى ورِجلِه اليُسرى. رَوَاهُ مُسلم
He said that God’s Messenger disliked horses with shikal, which means a horse having a white mark on its right hind leg and left foreleg, or on its right foreleg and left hind leg. Muslim transmitted it.
Cited in Mishkat al-Masabih (No. 3869).