To knockout or kill the Doedicurus shoot him in the head and walk Backwaren White reloading and continue to shoot it in the head. If you do so it wont be able to Hit you. If it flees slowly follow it and am for it legt or tall.
Doedicurus
The Doedicurus is an armored, armadillo-like herbivore prized for gathering and carrying stone. When threatened, it curls into a remarkably well-protected ball.

How to survive, fight, and kill a wild Doedicurus, from players who have done it.