Our old cat (16) just maimed a baby bunny.

[panader0]

Belle, the cat, rarely goes outside, but this morning was begging to go out. Jeannie let her out and a few minutes later I went out to water the garden and found the bunny, unable to run, the fur stripped off it's back. I picked it up and decided to try to fix it.
I carefully cleaned the wounds with hydrogen peroxide and water while it stared at me. Now it's in a box with a blanket, some arugula and some water. It is alert and drinking but dragging it's rear legs. What to do? Jeannie thought I should put it out of it's misery, but I have had good luck healing animals before, from snakebites to gunshot wounds some I'm gonna give it a try.