If your bun gets a scratch, even a small one, you need to analize it every day to be sure that it’s healing properly. A little one can be treated with some antibiotic cream like neosporin, but a scratch that bleeds needs to be seen by a doctor right away. Bunnies are very sensitive to infection and if not treated will die very quickly.
Typically cats and bunnies get along quite well, but cats are playful, so their nails need to STAY TRIMMED so they don’t hurt your bun accidentally. If your bun gets a cat scratch, it’s time to clip kitties nails and bring bunny to the vet…not necessarily in that order.

