One of the first dinos I always tame early on in the game even tho saddle is up there. It's always a good early game defense and offense just do this steps to get one early on.

-Kill a bunch of animals for meat and store em somewhere to spoil, the more the better.

-tame yourself a parasaur and ride it to collect unlimited narcoberries.

-craft a ton of Narcotics for tranq arrows and to keep theri sleep.

- make a trap with stone door frames and stairs

- aggro a theri and have it chase you to the trap.

-knock out your newly caught theri and give it tons of Berries(depends on level)

-once tamed name it and go on a Killing spree while you gather the resources you need for a base.

- there you got yourself a deadly pet chicken.