The otter is traditionally read as playfulness, curiosity and ease in the water of feeling. It stands for the inner child and for joy that comes naturally.
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.