Mice and rats are read as small worries that gnaw away unnoticed. Dream books link them to things neglected, and to the feeling that something is being taken bit by bit. A mouse running through your home points to little anxieties that have moved in quietly. Rats carry a stronger meaning: distrust, guilt, or the sense that someone close is not being honest. Catching or killing one is traditionally read as dealing with a nagging problem at last. A white mouse is gentler, often linked to shyness and small joys; it can help to notice what in your life is being worn down slowly.
Where in your waking life have you met something like this lately?
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.