Well i am very much up for avoiding scraps altogether to be fair....i understand where all of you are coming from and it his behaviour does not happen often....his recall is excellent btw so i will simply avoid any future 'problematic' situations by leaving the park and returning later..... so are you saying andrea that Rocks is not a downout aggressive dogs and he may simply be reacting to the other dogs signals??? i think i understand it now thankyou all so very much x