Not a question but a big thank you Patience (kshanti) for answering. Unfortunately we couldn't wait any longer than we did for an answer from the original person we sent the question to and decided to take our ferret straight to the vet. It is with great sadness that I have to inform you that he had to be put to sleep, the vet said he had fluid build up in his tummy which was empty of food, the black tar like poo was probably from bleeding up in his tummy and he was very weak. His quality of life was quite poor so we had to make the decision there and then. Thank you once again.