I would ask him to pay for treatment or return the snake. In the end, he may not do anything because the snake was purchased with the knowledge that he was sick. You will have to see what he's willing to do for you.

This link is also a good read on respiratory infections.
http://ball-pythons.net/forums/showt...ons-The-Basics

I've only had one snake with an RI and I had to take him to the vet and get antibiotics (oral, not injection) and treat him for a week minimum. I'm not sure exactly how long we treated him, but one dose of antibiotics is not enough.

I know he's a good guy and he means well, but sometimes he can be a little careless with the animals.

And to everyone that says not to go to his shop. For those of us that feed live to our snakes, this shop is really the only option. There are no other reptile stores in the area and no other pet stores sell live.