So, my neighbour has a dog. It's a sheepdog and bored stupid. It is also aggressive. I cannot go into my garden without being snarled at and barked at. My kids are terrified of it as they cannot play for it head butting the fence (6 foot on our side but it's a three foot behind it so I think it could jump?). I'm loosing the will with the creature. I've been looking at sonic repellants just for when my kids are in the garden. Has anyone used one? Do they work?