funny idea: can you put a collar on a snake?

You have to think out of the box to put a collar on a snake. For one, the neck region is not smaller them the body. This means that you will have to constrict its neck which would result in an injury. I would simply construct a small rubber cone and then insert it through the tail such that the head would not be able to slip through. Then I would attach a long string with a hook at the end and fix it to a wall.