“…it is often impossible to eliminate all instances of RG while you are treating it. Here’s how I suggest responding (once you have decided that the behavior was inappropriate, which is of course, a complicated issue all by itself): Look at the RG’er, and say something like “What was that?” in a low voice. I’d avoid raising your voice if you can, stay quiet and low-voiced and focused. Move forward toward the dog and back him or her up in space or step or two. Try to stay calm and quiet yourself but make it clear that you are directing your attention toward the RG’er. Tell him to sit and stay, again in a low, flat voice. I like to indulge myself here, and talk for a moment about how “we don’t do that here” or “what did you think you were doing?” or “your mother eats kitty litter.” It well might have no effect on the dog, but it’s quite satisfying. Keeping the offender on a stay, I’ll then go over and pet or feed the other dog for a moment. If the RG’er stays in place and is polite, I’ll go back and treat or pet him, again teaching him that good things happen to him if the other dog gets food/attention/toys etc. Exactly how this is done depends very much on you, the dog and exactly what the dog did.”