I don't know that you can find black walnut oil specifically.....but a lot of specialty markets will carry regular walnut oil. We tried it with a male some years ago....his eyes did darken but I'm not sure I can say the oil did it. You might also investigate Norwegan Kelp......we have used that also. It will also darken the coat and it is good for coat and skin health. Kay > VISIT OUR WEBSITE - www.showgsd.org> > ============================================================================ ============================================================================ POST is Copyrighted 2007. All material remains the property of the original author and of GSD Communication, Inc. NO REPRODUCTIONS or FORWARDS of any kind are permitted without prior permission of the original author AND of the Showgsd-l Management. ALL RIGHTS RESERVED. ALL PERSONS ARE ON NOTICE THAT THE FORWARDING, REPRODUCTION OR USE IN ANY MANNER OF ANY MATERIAL WHICH APPEARS ON SHOWGSD-L WITHOUT THE EXPRESS PERMISSION OF ALL PARTIES TO THE POST AND THE LIST MANAGEMENT IS EXPRESSLY FORBIDDEN, AND IS A VIOLATION OF LAW. VIOLATORS OF THIS PROHIBITION WILL BE PROSECUTED. For assistance, please contact the List Management at admin@xxxxxxxxxxxx VISIT OUR WEBSITE - www.showgsd.org ============================================================================