I need to help a hurt bird fast!!?

It's a very small bird that just got attached by my cat. There are NO wounds. But the legs seem to be paralyzed. The wings work. It's breathing very hard. I put it in a plastic tub with a towel in the bottom for padding. My parents say they don't want to take in to rehab. They said it's to much hastily for every bird our cat hurts. HELP!!! WHAT CAN I DO TO HELP IT NOW??? ANYTHING!!