My dog was convicted of being a dangerous dog in PA can you help?

A few months ago my 4 year old english setter got loose and was running around of neighborhood, which is a somewhat rural area. He gets loose often because he can open the doors in my house. That same day i arrived home to find the local dog catcher at my door claiming that my dog had killed the neighbors peacock. I was written a summons to appear in court. My neighbor never found the body of the peacock all he found was feathers. At the hearing he claimed that his wife had to spend three days in the icu because she was so distruaght, but he had no evidence of this. He also had letters from other neighbors claiming that the dog was seen running loose and that he had apparently killed one of their rabbits. (I dont see how he could have open the cage to kill the rabbit). My dog has never showed any aggresion towards humans or other animals ever. I regularly take him to the dog park with no problems. Today i recieved the guideline to which i must comply, its states that he has to be muzzled when outside, always on a leash, neutered, chipped, registered every year as a dangerous dog, and if he gets loose again they will put him down. My dog has been trained from birth to hunt. He is a bird dog, there is no way he can differenciate between a wild animal and a pet. He was going off of instinct. I agree that he should always be on a leash, but that means ill never be able to take him hunting again. I am going to appeal, i just need a really good arguement to back me up. Can anyone help?