Hobble Mount

When you cast hobble mount as a successful melee spell attack against a horse, wolf, or other four-legged or two-legged beast being ridden as a mount, that beast is disabled so that it can’t move at its normal speed without incurring injury. An affected creature that moves more than half its base speed in a turn takes 2d6 bludgeoning damage.

This spell has no effect on a creature that your GM deems to not be a mount.