I agree!

Never leave them unsupervised at any time unless he is in his cage in the house.


Have you taken him to the vet yet?

Also if it was a random stray
1)get your bun checked for diseases it could have caught from the cat
2)catch the cat and bring it to the shelter

How do you know it was a stray?

Youve also changed your story, first you said the rabbit was being mishchivious and now your saying the cat just up and attacked him?