maybe a bee stong him or an ant bit him?

My bunny was a dwarf rabbit & with the dog barking or snarling, never scared her. I don't know how many times Max nearly trampled the bunny & she never moved. I think if the bunny is use to other pets in the house its more, unlikely that pet causeing fear in it.

Was there another animal around.. oh! what a bird??
Crows & Seaguls scared the doo doo out of my bunny.