Jafar's Horse is a black horse, that Jafar rides in the beginning of the movie, Aladdin. It is used for the vizier's transportation from a place to another. The Horse briefly appears in Disney vs. Non-Disney Villains War and Heroes vs. Villains War.
Disney Vs Non-Disney Villains War
The Horse appears in the original tournament, as it is used for the fight of Jafar, against Zigzag and his horse. When the two villains nearly face off each other, Jafar reveals his trump card, as he uses flamable magic against Zigzag, dropping him off his horse. Coincentally, Jafar's horse disappears also from the battle, making it ambiguous whether it survives the battle or not.
Heroes Vs Villains War
In the early events of the war, Jafar travels, with his horse, to the lair of Zigzag, where he recruits him, for the purpose to kidnap Jasmine and bring her to him. The Horse does not respawn in the war, thus it's fate remains currently unknown.