Just had such a scary experience in the park with our dog (Lhasa Apso cross). A large what looked like Afghan crossed with a Greyhound came bounding over, barking aggressively at us, trailing a long line with the owner way across the field. It started to run in ever decreasingly tight circles around our dog barking loudly whilst our dog began crying in fear. Owner still way across, shouting now but dog paying no attention. My husband ran over, picked up our dog and we walked away, we shouted over to the owner to come and get their dog, they were still shouting its name (uselessly as it was completely out of control!). We went through into the next field, dog followed us (owner still shouting uselessly!) we quickly walked away, our dog on a lead. As we looked back, the owner had reached the dog, still shouting but could not catch it! Warned the next person we met, who had a puppy, to go around and not past.
Maybe using a long lead because there was no recall, but this was no good as the dog had gone so far from its owner.
if our dog was a fighter (rather than a cryer!) could have been a really nasty situation.