Dreams dictionary: Tail
Dreams dictionary: Interpretation 1
To see only the tail of an animal in your dream signifies annoyances and complications in a situation where pleasure was expected. If the tail is wagging, then it symbolizes excitement, thrills, and joy. If the tail is between the legs, then it represents fear and humiliation. Alternatively, the dream represents balance. Or it may be a pun on "being tailed" as in being followed or chased.
Dreams dictionary: Interpretation 2
To dream that you have grown a tail represents an aspect of the past that still lingers with you.
Dreams dictionary: Interpretation 3
To dream that you cut of the tail of an animal symbolizes that you will suffer misfortune as a result of you careless ways.
Dreams dictionary: Miller Dream Interpretation
To dream of seeing only the tail of a beast, unusual annoyance is indicated where pleasures seemed assured. To cut off the tail of an animal, denotes that you will suffer misfortune by your own carelessness. To dream that you have the tail of a beast grown on you, denotes that your evil ways will cause you untold distress, and strange events will cause you perplexity.