Tranq arrows are fine, shoot in the face, walk backwards and continue shooting in the face, if you can shoot the underside when he turns, then go ahead. It is a little difficult to time that however. When it starts to run away from you, just keep in front of it and keep shooting it in the face. If for any reason it rolls up into a ball, let it go and find another one. If you are intent on taming it, put a structure around it to keep it safe, then sit by it for about 45 minutes to an hour, it will heal faster if you are within render of it. Leveling up the melee allows it to collect more rock with each swipe of the tail. If you are so low, put most of it in weight and some in melee, this will allow you to collect more with less trips. If you have a tribemate, and you are using a Quetzal or a skiff, then only level melee.
In ark mobile Dodecirus can be found in large numbers at the redwood forests at the top left of the map or the mountains.
Dodecirus are knockout tames and they eat berries
They have armour on the top where they take less torpor so shoot their underside and if you damage it to much it will curl into a ball and it will be hard to knock them out and if you hit a Dodecirus all nearby Dodecirus will attack you
Dodecirus are slow so you dont need a mount to outrun them and you wont need a trap because it might not catch up to you.
Abilities when tamed:
Dodecirus will turn into a ball and roll really fast also they can destroy rocks,bushes and trees and gather their resources and they have a weight reduction on stone abd the saddle is unlocked at level 34 and made in the smithy.