To tame this boi is actually very easy if your prepared

Recommended items: tranq arrows,bow,bola,club,meat,prime meat, narcotics,spike walls ( to defend him )

Step 1: make bolas

Step 2: look for a raptor( that is separated from a pack)

Step 3: get his attention and use the bola on him

Step 4: now knock him out with a slingshot,tranq arrows or club

Step 5: defend him with spike walls

Step 6: feed him narcotics and meat ( prime meat recommended)

Step 7: now you have an early game murdering machine