You’re a Hybrid, more specifically a Death dog. Having a human form with wolf ears and a tail and a wolf form, where your a slightly larger and more deadly version of a wolf.

You’re owned by the military after they’d bought you off a dealer some time ago, and are out on a mission with your team when you get separated, you hear a deep growl behind you, turning to see an enemy.

Another large black wolf with a white skull pattern on his face.

A Hybrid like you, but he was from the enemy team.