It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that he said: "Many a time I saw the Messenger of Allah (peace and blessings be upon him) praying while donkeys were scuffling with one another in front of him (peace and blessings be upon him)."
Hadith Referenceالمعجم الأوسط / باب الألف / 2699
Hadith Takhrij«أخرجه البزار فى «مسنده» برقم: 4802، والطبراني فى «الكبير» برقم: 11305، 12136»