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The paint ball guns are one of the best deterrents for dogs.....the owner cannot mistake the fact that the dog has been marked by someone and it's fair notice that his dogs are getting into places they should not be in. If they are difficult to see at night, get a small inexpensive laser sight for them.
After a couple of times and if they continue coming in your yard, catch them up and call the humane society, after a couple of $100 bills to bail them out they owners usually get a bit more careful with their animals.