Abu Dawud
Prayer
Book Number: 002 / Hadith Number: 717
Narated By Al-Fadl ibn Abbas : The Apostle of Allah (pbuh) came to us accompanied by Abbas when we were in open country belonging to us. He prayed in a desert with no sutrah in front of him, and a she-ass and a bitch of ours were playing in front of him, but he paid no attention to that.