It is black right at the beginning of the tail. Is this tail rot? MBD? I don't know what it is. I have plans to take her to the vet within 2 weeks. Pictures linked below. Can post more.
Pictures:
https://twitter.com/DapzFapz/status/622220360373673984
Pictures:
https://twitter.com/DapzFapz/status/622220360373673984