I'm one of those people that doesn't pen up my dogs. They learned really young that they don't bite. They also know where the four strand fence is, and they don't cross it very often. There's a highway on one side, one neighbor on two sides, and another neighbors cow pasture on he other. My dogs are herding dogs, but they know to leave the cows alone. My chickens and ducks are "free range" also. We've never had a problem with the neighbors, and we have an understanding that if there were a problem, I can't do anything about it unless they let me know. Bepp, I don't think you are being foreword enough with the neighbors. The dogs don't know the boundaries, and the owners don't see an issue. They took on the responsibility of owning these animals, it's up to them to make sure they keep them contained. Wyoming is a fence out state. Meaning, if you don't want someone or their animals on your property, then it's up to you to fence it and keep them out. I don't know what FL is, but it may be something to look into. I'm not one to think on my feet, so I think sitting down and writing a letter with everything outlined is a good way to go. It's your land, you can have anybody you want there, to do anything you feel is fine (within the limits of the law) and that includes letting the kids ride their four wheelers anywhere you give them permission to, and you have the right to do it without being harassed by his dogs. All he has to do is keep them on his side of the fence. It doesn't matter how, but it needs to be done. And the problem is solved. With a letter I think you can express what you need to.