I had a alsation grey had same habit any dog showing any form of aggression would get run down the end scenario thrown in midair he threw a large Norfolk one day up the side of a oak tree was never the same again he started this habit at about ten mths ,this was enough ta take the stink out of the aggressor ,just a trait bred in the most loyal kind soft temp around kids and the home the protective gene stood in the xs and still does three generations on .atb bill