If you tame one, I suggest using this method. First, build a 1x1 of any material except thatch ( since they can break it). on each of the walls, place a window. Whenever you need to shoot, you open a window and shoot. Close the window to reload and to be protected from the needles. I had my tribe mate do this because we made a bet that if he survived while trying to knock out the Dino, he would give me his armor. Hope this helps you tame a velonosuar!

More Velonasaur Taming & KO Tips