Easy and cheap way to tame (recommended to level your speed and use high quality rifle or shock darts. Maybe bring a creature to defend yourself in case something goes wrong)

First grapple it’s tail or upper leg. Reel in as far as possible and switch to tranq weapon. (Don’t grapple too low or you might get killed by trample damage) Shoot it until it flees. Once it flees, the grapple will detach. Chase it down and shoot it quickly. It’s torpor drains very fast so if you don’t shoot it fast enough it’s torpor will drain and it will turn around and attack you. Once knocked out, put some meat in it and shove it’s face full of narcotics and it will eventually be yours.