How about teaching him an easy command? Also incorporate a toy in with their play so the biting is focused on the toy and not the heads of the little ones. I have a smaller dog too and Victor would do the whole mouth head thing but I taught him an easy command but sometimes he is too fired up to listen. I also had my husband do a section in our yard so if the little one needs time to himself he can go there and be safe. I never allow the larger dogs to be out with the little one unsupervised though. Try the toy thing and see if that works and when he does the head mouth thing let him know you don't like that and that it is not allowed.
Jamie Lee~blk GSD~6/24/10
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