Muawiya bin Hudayj passed by Abu Dharr while he was standing beside a horse of his and asked him, "What are you tending to with this horse of yours?"Abu Dharr replied, "I believe this horse has had its prayer answered."Muawiya asked, "And what is the prayer of an animal among animals?"Abu Dharr answered, "By the One in whose hand my soul is, there is no horse except that it prays every dawn, saying, 'O Allah, You have placed me under the care of one of Your servants and made my provision in his hands, so make me more beloved to him than his family, his wealth, and his children.'"My father said that Amr bin Harith corroborated this from Ibn Sahammasa.
حدثنا حجاج وهاشم قالا حدثنا ليث حدثني يزيد بن أبي حبيب
أن معاوية بن حديج مر على أبي ذر وهو قائم عند فرس له فسأله ما تعالج من فرسك هذا فقال إني أظن أن هذا الفرس قد استجيب له دعوته قال وما دعاء البهيمة من البهائم قال والذي نفسي بيده ما من فرس إلا وهو يدعو كل سحر فيقول اللهم أنت خولتني عبدا من عبادك وجعلت رزقي بيده فاجعلني أحب إليه من أهله وماله وولده قال أبي ووافقه عمرو بن الحارث عن ابن شماسة
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Its isnad is sahih. Abu Shammasah is Suwayd bin Qays Tujibi, whom Nasai and Ibn Hibban rated as trustworthy. Hakim graded the hadith sahih in 2/144, and Dhahabi agreed with him. It is found in Nasai, 6/223, no. 3579.