http://www.ebay.com/p/dog-head-concho-dipped-in-pure-silver-retriever-labrador-1-1-8-wide-screw-back/1948399605?_trksid=p2047675.l2644
Best I could find.
Modeling clay that you can bake in the oven would only require your hands to shape. Mistakes would be easy to fix before baking. No sealer required after baking. Win win win.