The kamaitachi are weasels that ride the whirlwind in Japanese lore. Dream books read them as sharp, sudden setbacks that come and go before you can see what happened.
When this appeared in your dream, what were you feeling?
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.