Absolutely take the dog to a vet. Plus, report this atack to the proper authorities!!!
This way, if you have to shoot the neighbors dog, you will have probable cause to back up your actions.
US Naval Aviation AMSC 20 years ( retired) ASW/Aircrew Wings, P2V plane capt. Also a Tail hooker, US Naval Academy (DI) Shooting Instructor (Annapolis) NDW shooting team member. VN vet, Bluenose and Shellback.
Alway keep your six covered