Horse meat is permissible: Jābir reported that on the day of Khaybar the Prophet ﷺ forbade the flesh of domestic donkeys but permitted horse flesh, and Asmāʾ bint Abī Bakr said they slaughtered a horse and ate it in the time of the Prophet ﷺ. Domestic donkey meat, by contrast, is forbidden. There is some ikhtilāf — Imām Abū Ḥanīfah held horse meat to be disliked — but the stronger view of the majority (Shāfiʿī, Ḥanbalī, and others), based on the explicit ḥadīth, is that it is ḥalāl.
Evidence — the daleel
Sahih Muslim 1941 ṢaḥīḥSahih al-Bukhari 5520 Ṣaḥīḥ
On deen2u
Informational, not a personal fatwa. Consult a qualified scholar for rulings on your situation.