What is a good non lethal way to deter dogs from your property? I have some iceheads for neighbors that are trying to contain their pit bulls in a 4 foot fence. Needless to say 4 feet does not get it. The dogs are out repeatedly and causing mischief. They have been on my property including my front porch several times. They have growled at some of the neighbors in their own yards. One of them tried to attack a neighbors dog through the neighbors fence. I cannot tie out my goats or free range my chickens without constant supervision because you never know when these dogs will get out. I cannot afford more fencing and I don't want to kill these dogs. I know it is not the dogs fault they just have bad owners. Any ideas?