An Orion spine boar was a type of animal lifeform known to the Orion civilization, a boar. It has spines and more than one heart.

Ganik thought of a plan he'd set in motion as 'like a spear already cast through an Orion spineboar's hearts'. (ST novel: Excelsior: Forged in Fire)

The spine boar might hail from the planet Orion. In ENT episode: "Bound", the roasted spiked boar-like animal seen on Harrad-Sar's barge, could be an example of such an animal. It may be similar or even related to the Klingon targ.