Have you gotten a sample to the vet?? i can do a feacal for you, but the thing that you should remember, IS THAT ALL REPTILES HAVE PARASITES, ALL THE TIME. THERE IS NO SUCH THING AS A WORM FREE ANIMAL. It is a very bad idea to 'deworm' the rats you give him, as the parasites would build up resistance towards the anthelminthics and then there is no cure. you end up with super infestation and this will kill your snake. you should be worried about lungworm and coccidia. rather deworm the snake, give it a stong dose and get it over with. the snakes immunity wil do the rest. just dont od it like bv said.