Why Corgi see the dog to pinch Corgi is more mobile

Why Corgi see dogs on the choke Corgi is more active, although smaller, but under the protection of the owner it will feel very safe, in the encounter with other dogs it has no fear of psychology, will jump straight up. But the fight between dogs is not necessarily an attack for the purpose of injury, it may just be an ordinary fight, in order to get better acquainted with each other, not particularly fierce when not too worried.