Just shoot him twice with sling and hes out.
Dilophosaur
A Dilophosaur is a small, relatively weak dinosaur. Still, they're easy to tame for newer survivors, and are not hard to manage. They serve as guard dogs or pack-hunters, but are easily killed. Don't get too attached to them, as they likely won't survive combat against stronger dinosaurs.

How ARK players tame and knock out the Dilophosaur: what to feed it, what to knock it out with, and how to keep it safe.