Glad to see the last couple of posts about not all dogs being friendly with other dogs. My blue heeler is one of those. We have had her in training but it didn't do a whole lot. We are just careful when outside. She likes people and absolutely loves children and has been great with our grandkids. It is just other dogs she has a problem with.
I read about a yellow ribbon movement where the yellow ribbon on the leash means doesn't play well with others. I put it on her leash but I must be the only one who read that article. Even when I move away, many people chase us to let their dogs say hi. I have to ask them to stop and explain that she is onery to other dogs. Don't know what else to do.