Ahh thats a bummer! Hope your son is ok though can hit kids hard sometimes. I had a bull cross, and she was never shown a ferret and she was very nosey so one day i was feeding my ferrets, the bull cross came running up as if there was nothing going on and my hob just jumped out his hutch and he nailed her right on the ankles....it tort the bull cross!
Aye the other bloke it right i rekon dogs behave very different when there master isnt about.
FM