1) Set two bear traps in-line with the Therizino. Wait for the traps to open.
2) Shoot Therizino with rifle tranq dart.
3) Pissed Therizino will chase you.
4) Stand behind first trap.
5) Once Therizino is caught, stand behind the second trap - fire tranqs into it as quick as possible.
6) Most Therizinos will break out of first trap and get caught in the second trap - keep shooting tranqs.
7) Place a third bear trap if you are near pissing yourself.
7) Once it drops, feed it kibble, berries, and narcotics.
8) Repeat until you have an army.