Musnad Ahmad 1816

It was narrated that al-Fadl bin ‘Abbas said: The Prophet (ﷺ) visited ‘Abbas, whilst we were in some desert land of ours. He stood up to pray - I think he said: ‘Asr - and in front of him there was a small female dog of ours and a donkey that was grazing, and there was nothing between him and them to screen him from them.