I might want to avoid him if I had a better description than a man in his 50s. Do I look for a Yorkie or a Great Dane? Both can bite, of course, but even the owner would have trouble restraining a Great Dane.

A mastiff or other type very big dog near my block was on a leash but still managed to maim badly a much smaller dog because the dog walker probably weighed a lot less than the dog she was paid to walk. She could not control the dog on its leash.