A dragons tail isn't very flexible, it can get caught in rocks and such so you should look around the viv for small cracks he can catch it in (if he is a young little tard). Like a crack between 2 bricks or something. Mine got his tail stuck in the Y of a tree branch one time, i laughed at him for being fat but helped him anyways. Another thing to be wary about is how you heat the tank, dragons often get their tails burnt for improper lighting/heating. NO HEAT ROCKS. They burn tails and bellies and should just be off the market in my opinion.