MAXIMUS doesn't like other dogs anywhere near his property(us).
He has played, very well in fact, with a dog through a fence. Kisses, smelling, and running along the length of the fence. I'm quite sure they would have been great without the fence. The only time there was an issue, was when I went up to the dog to pet her. MAXIMUS got really nasty with that, growling and showing the mean fur.