Is your yard fenced in?

If not, perhaps you can fence it in (if you own the house) so your dog won't go over to their yard anymore. I wouldn't want them to hurt your dog. Not sure if they're the type of people to do something like that. Also, that would keep their kids out of your yard. Not sure about the cats. I think there is a spray that you can spray your yard with, that keeps cats out but doesn't have an effect on dogs.

I'm a firm believer that fences make better neighbors.

I wouldn't call the landlord because they might find out you called and do something mean to you or your dog.

Good luck.