In general Arabic usage shāh can mean a sheep or goat; the commentary at this point specifies a wild bovine or wild animal as the model. Replacing that contextual sense with a domestic sheep would distort the particular comparison.
Bi-Ḥawmal gives the location, while mufrad describes solitude or being apart from others. The lone animal’s upright, pointed ears provide an image of both anatomical shape and attentive posture.