Personally, I have chased neighbors dogs out of my yard with 6 inch skinning knives before while the neighbors watched... They don't tend to come back after that... I don't have to worry much about anything on the farm, if a dog goes in the field with the horses, he isn't likely to come back out with all skin intact, if he comes out at all... Apparently chasing dogs down and stomping them is fun if you're a horse...Even if so, if it is your neighbors dog that’s not your place, so just talk to them about it