Sympathies.
If there's an afterlife, your rabbit has laid down with my cat (who always was kinda rabbity) in a nice field of clover.
Doesn't save you missing them, but I find it's very pleasant to picture them there...
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"Alas, our dried voices when we whisper together are quiet and meaningless, as wind in dry grass, or rats' feet over broken glass in our dry cellar." --TS Eliot, "The Hollow Men"