Bob,
Next time up your ISO and/or increase your shutter speed as if you were shooting an action shot. This will increase your chances of stopping the dogs movement.
Try putting the dog on a leash and tying it to the boys ankle. After a while the dog will settle down. You can edit the leash out later if need be.
Advise the boy not to react to the dog but only to the camera and your direction. In times like this, or, when an adult is posed with a small child, the adult will try and control the child's every movement thus spoiling their own pose. Best to advise them to ignore the pose of the dog or child as if they were not in shot at all.
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Mike McCarty
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