Share 'Aggression between two bitches.'

Yesterday morning my two bitches had a serious fight, I've never experienced such aggression between two setters before, or any other dog for that matter!  It started over a treat, I gave them both a treat, as done many many many times before, however one dropped theirs and the other one went to pick it up and then all hell broke loose.  They really tried to hurt each other, neither my shouts or…