I am not "afraid" of dogs, but do pay close attention to their body language and behaviors, and the behavior you describe does point to a potentially dangerous dog(s). If the neighbors agree to move their invisible fence back a bit, THEN could u Also erect a physical fence? Even though an animal CAN run through an invisible or electric fence, the neighbor dogs may never do so since they know it is there. But still, what a stressful situation to have to endure. I hope you can find a solution that gives you peace of mind that you and your animals are secure and safe.