Dreaming of a dead mouse often symbolizes the resolution of minor worries or nuisances in your waking life. Mice are typically associated with small annoyances, fears, or anxieties that nibble away at you quietly. Seeing one dead can indicate that you are overcoming these small issues or that they have lost their power over you. This dream might reflect a relief from stress or an end to feelings of insignificance or being overwhelmed by trivial matters. It can also suggest a release from a situation that has been lingering in your subconscious, signifying a time to move on and initiate new beginnings. However, consider the context and emotions in the dream, as they can offer insight into whether this change is welcomed or if there might be lingering feelings of guilt or sadness regarding the resolution.