I've been out with the dawg for an evening walk and came face to face with a large dog, (rhodesian rigdgeback/cross) with the owner beig towed behind. (it was a fine specimen of a dog all muscle and lovely coat) The dog was wearing a flat coller and was attached to a very thick chained leash. The owner had no control what so ever. My dog was off lead and walking to heel. As we crossed the other dog made a lunge for my fella (the owner couldn't restrain their dog) it put it's head on top of my dog's neck and was growling, the growl was a very deep growl. My dog froze, froze to the extent that it was rigid and wouldn't dare flinch. It's the first time I've ever seen my dog that rigid and frozen. The other dog owner was saying NO, NO, NO, NO, NO . I asked them to be quiet and to keep still. I stood about a yard away and waited for the other dog to relax a little and then called my dog to heel, which he did. Major catastrophe averted. Any movement on my part towards my dog or the other dog, I think would have resulted in a blood bath. I was tempted at one point to intervene, but kept calm and luckily it turned out okay. Because the situation ended quietly and i got my dog back to heel without a scar, I think I did the right thing. Would you have done anything differently?