Very weak or denounced — not to be relied upon or attributed to the Prophet ﷺ with certainty.
It was narrated from Kathir bin 'Abdullah bin 'Amr bin 'Awf Al-Muzani, from his father, that his grandfather said:“The Messenger of Allah (ﷺ) said: 'Start with the horses on the day that you bring (the animals to drink).' ”