How about bring this unit back?

[446400887]

[Heretical_Cactus]

Giant Rat ?
(Size of a Slave Rat/Dogs)

Or Wolf Rat

(Size of Wolf)

Maybe even BroodHorror (Giant Giant Rat)

[Eder]

Only if they are mounts to other units, like the warg riders from lord of the rings, if you kill the mount the rider switches to a ground unit, if you kill the rider the mount becomes like a bull on the loose that could drag players by their feet for a short distance.