About a month ago my kids and dog and I went for a short hike on the Barton Creek Greenbelt in Austin. There are signs everywhere directing folks to keep their dogs on leash. There were more dogs off leash than on and most of them were pretty well behaved. I didn't let mine off leash. We were on a pretty narrow trail when this French Bulldog or maybe Boston Terrier came bouncing up the trail. No parents in sight anywhere. He was jumping up and down and bouncing off my kids. My dog was heeling really well considering but finally he had had enough and looked at me and then grabbed the other dog ever so gently around the neck. He didn't bite down or growl or anything just grabbed hold. That other dog got really still and at that moment his parents came around the bend in the trail. "Oh theys just deciding who's terreetory this is, that's how dogs do" And they walked on down the trail with their dog. Too many people believe that the rules apply to everyone but themselves.