The nine-tailed fox of East Asian lore gains a tail with each century of wisdom, and dream tradition reads it as cunning, charm and shapeshifting intelligence. It can stand for allure that hides its true aims, or for wisdom grown with time.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.