What would you do if another dog mauled your dog?

Let's say,for instance,a PITBULL jumped a 5 foot fence,grabbed your dog,by the neck,and dragged him 20 yards and wouldn't let go. Well,this all happened to me today,ON CHRISTMAS. I was outside,letting my rat terrier use the restroom,when all of a sudden,the neighbors pitbull jumped their fence and attacked my dog. We had to get the law involved and took our dog to the emergency vet clinic. After checking out dog out,it was in best interest that we put him to sleep because he had a large gash on his neck and lost alot of blood,a broken rib,punctured lung,and an enlarged heart. Poor thing was defenseless. The kicker is,this isn't our first rodeo with their dog jumping the fence. He has done this about 7 times now,but luckily our dogs were in their cages,but this time,one wasnt,and he paid the price. I wanted the dog taken away,but the K-9 deputy was taking up for the pitbull,saying it wasn't the dog's fault. The neighbors said that their dog never bit anyone and wasnt aggressive. I told them to go take a look inside the burial box and tell me that an aggressive dog didnt do that to my dog. The deputy also said that any dog can turn on you,even a chihuahua. I told him,with all do respect,let a chihuahua bite you on the leg,and let a pit bull bite you in the same spot,and SEE the difference.I told him that if a chihuahua jumped the fence and attacked my dog,it would still be alive right now. He didnt have to much to say after that. He did write the owner a citation,and the owner is responsible for the dogs medical bills,but is there anything else I can do. We live in Louisiana. Pitbulls are not banned here,but most home owner insurances wont cover you with that breed of dog.Also,there is no leash law in our city. If they dont get rid of the dog,what can I do?