Ericka, I see that you're in Antioch and also see that means that you're under Nashville's jurisdiction as far as animal control laws go. Check this link (it outlines Nashville animal ordinances):
You have been more than patient with these neighbors. Them permitting their dogs to enter your property falls under permitting their animals to "be at large", same as if they opened the front door and let them run all over the neighborhood at will. I'd call Animal Control and tell them what you've told us. It can't hurt.