//What "consequence " do you suggest, APG? A smack around the snout, yelling at him. Do tell, please.//
Why do you presume I would use violence as a training method? How judgemental. I have had greyhounds so don't lecture me on how they are different. We also have lurchers, working gun dogs and sheep dogs.
I would have used a stick -carefully, to try to push the bag away while sternly saying 'No' (not yelling like a banshee) . Even if this did not work it would make it clear that you as the leader were not well pleased. Then, when the dog had finished misbehaving, and came up to me I would say 'no' again and send it away. I would decide when it could come back into the 'pack' -that's you BTW.
yes you go ask your "animal behaviourist" what they would do. If you are happy with how that works that's great. There are hundreds and thousands of working dogs that have never (thankfully) been anywhere near a 'behaviourist' and are highly trained well behaved, and moreover, obedient animals.