Your best bet is an electric collar with an in-ground wire that establishes the boundary. I have done this with a very stubbonr coon hound ... it worked the FIRST TIME. Best money I ever spent because the neighbors were fixing to put out a contract on the hound.
You bury the wire where you want them to stop. The wire traces back to the controller in the garage. With the collar on the dog, it will mildly shock the dog as it gets closer to the boundary ... and really lets him have it when he gets to the boundary.
Even stupid dogs like yours will get the message.
Unfortunately, there is no thermonuclear setting on the collar which could vaporize the dog you don't like.