If you call animal control, keep in mind that if a loose dog is illegal, then loose cats probably are, too. You may be fined.
I suggest, for the time being, attempt to befriend both the dog & the new neighbors. After all, you may have to live by them for a very long time. No use starting out with a feud.
Cats are not stupid. I’ve seen cats completely intimidate dogs. It’s not likely ONE dog will terrorize the cats. That usually takes a pack of dogs.
Keep an eye on the situation, but be cool.
I tried that with my neighbors dog. The neighbor is a cop.
The dog tried to bite my face off.
They put up a fence so I didnt have to shoot it.
Worst advice of the thread.