Checked Andrews' book on animal symbolism (Animal Magic, I think it's called.) Mouse indicates, according to his symbolism (which I've read cover to cover, so it's in my subconscious, too) a fine attention to detail.
Maybe I'm losing my big picture, or have been drowning myself in worry over minutia. Maybe I'll ask TexYote for a tarot reading, as a just-for-fun thing. It'll probably come up pentacles and swords.
I like pentacles, though. I love pattern and stability and the "earth" end of the four corners.