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UPDATE: The bunny has passed away over night. It is very sad, but Keiko, with my instruction, tried all that she could.

IF YOU COME INTO A SIMILAR SITUATION:
Get rabbit away from cat, or dog(or whatever caught it).
Look it over for injuries.

Scrapes and skin showing: Neosporin or other ointment is great. If its bleeding get a gauze and wrap it, or use some blood stop powder.

Broken leg: Determine severity of brokeness. Vet, Euthanasia or natural healing may be necessary depending on extent. Younger rabbits may heal easier, but might also not take the pain and shock of breaking the bone as easily.

Internal injuries: Most internal injuries are hard to tell, and most result in death.

In all situations, if the rabbit seems savable first put it in a quiet area where u can keep an eye on it. It needs to be away from other animals, and it should be offered water. Bowls are prefered as not all rabbits know how to use a bottle instinctually. Offer grass and easily digestible things like a little bit of apple sauce or banana. If they do not drink within 24 hours a syringe with water and 2 or 3 small drops of mollases may be used. Mollases will give it energy, but dont give too much.

If the rabbit is seemingly under a month offer some puppy formula via syringe. Esbilac Goats milk formula is the best as it is least likely to cause bloat. Only use cows milk as a last resort as it is hard for them to digest, and they cannot survive on it. Be sure to keep it warm with either a hot water bottle changed ever hour or so, or a heating pad that it can move on and off of.

If it is a wild rabbit contacting a rehabilitator may be necessary depending on laws in your area. If the rabbit(over 1 month old and not domesticated) is not seemingly harmed after 24 hours of observance release it.

Any questions you can PM me.