The other thing I think about when I see a dog off leash is what about a stray dog that comes to attack your dog?

I saw a couple jogging today with two identical dogs (labs), one younger, one older. The younger dog was on leash, but the older one was not. She was leading, and even worse, she had no COLLAR on. No tags. Very busy street. They really trust their dog, I can tell, but what if their dog gets attacked by another dog and she runs off in fear or in chase? There's not even a way to identify her with no tags!

I had two stray dogs (they escaped their yards, I knew where they lived) meet in my yard and tear each other to pieces one time. They both ran off before AC could get there. That's just to say that there are aggressive dogs who get out and have no compunction about attacking another dog.

Karen