It's as if beavers found love in bearded dragons, and had a beautiful child.

Thorny dragons have a low Aggro radius, so if you don't want to fight one, running past it is simple!

A good idea is to get a shield use it so you don't get Knocked out

Sit on a small ledge so they can't get up, then use a boomerang ( for lower level players), or a bow to kill or tame. When taming, take time between shots to allow torpor to rise, and to avoid spikes.