As already said are yo sure they are not just playing roughly? I have whippets and when they all play together the teeth come out there is growling and snarling grabbing each other round the neck and by the legs. Also the odd squeal were one has bitten down a bit hard but its all play. I used to have 2 GSD father and son and our neighbour quite often knocked on the door and said the dogs were fighting in the garden. They weren't they were just playing rough.

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Sammy you may be gone but your sprit will always live on in the sunbeams R I P Sammy

William- 6/11/03 - 24/3/10
Midge - 8/2/11 - 10-2-11