An iguana that I acquired through a rescue has been having some problems. It seems that there was a retained shed on the base of its tail and that it has caused dry gangrene that is spreading upwards through the tail. this is potentially deadly to him and an amputation is necessary. I am not entirely unfamiliar with vet medicine ( i volunteered for a summer at a reptile vet) but I need to know where the natural breaking point is on the tail so that I can be sure that the tail will grow back naturally and healthy. How can I find this point? thank you.