A tail is a prolongation of the rear end of an animal. The Bible describes the tail negatively as the end or the least of something.
Positive: Seeing a tail in a dream could denote a person’s rank, spiritual action, completion or end-result, or adjustment.
Negative: Dreaming of a tail could represent vulnerability from the past, rejection, fear, condemnation, humiliation, or the past still lingering with you.
(Deuteronomy 28:44; Isaiah 9:15; Revelation 9:10).