Dinopithicus taming is really traumatic, you essentially slaughter every single monke until the alpha remains. Then you shoot it until its bleeding on the forest floor and i was complaining about shooting a creature with sleepy bullets
To tame a baboon thing you will first have to murder its friends and family including its children. Then you beat some sense into it until it is at less than 85% health then shove food in its mouth against its will and it will somehow start to love you.