An animal. It is depicted side on and facing to the right.
It is a large cat-like creature with a small head, no mane, and a long tail. Notches carved into its body may represent the spots of a leopard. It is approaching the rear of another animal (figure A9) but it may not be about to attack (its head is lowered and seems to merely butt against the other animal).
A leopard (DAA, Nersessian).