Zechariah 14:12, 15

Now this will be the plague with which the LORD shall strike all the peoples that have warred against Jerusalem: Their flesh will rot while they stand on their feet, and their eyes will rot in their sockets, and their tongue will rot in their mouth.

So like this plague [on men] there will be the plague on the horses, mules, camels, donkeys, and all the livestock in those camps.