Time Out!
Sometimes just like in every other situation, extreme measures have to be taken. There are some pets that have sharp teeth and, when afraid, lash out and bite. So, it appears that this vet had dealt with something like this before and created a unique way to handle it.
This little lizard seems to have gotten a little violent and has been put in a lizard timeout. By doing this, the vet can take this cute image and be able to ensure the X-rays are correctly handled.