The collie gathers the flock and keeps it together, so it is read as guidance and care for the group. Dream books link it to someone who keeps things in order, or to that role in yourself.
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.