You can ABSOLUTELY trap this to tame it if you want to. It's not particularly easy to get it in the trap. I had to run up to it a few times to get it to chase and not fire spit or breath.

Use a dino gate, then triangles down to one block. Make a 2 block hallway. Walls 2x high so it doesn't jump out. Ceilings if you want to be safe. At the end of the hallway, hit the button that changes the wall to the doorway WITHOUT any wall space above it. Stack 2x high.

Position yourself directly behind that opening about 50 feet back...fence foundation and a wall for cover from the breath. No chasing. No de-aggro. No other wild creatures messing up your tame...Good idea to place a bed just in case...it's going to be a long tame.