i don't use this anymore, but i did call diamond about 2 years ago when i did use it. they do make it for costco. i doubt costco does anything else to it and i highly doubt that is "costco's" recipe. it is 99% identical to the premium edge food made by diamond under their professional line. it's also similar to chicken soup or maybe identical to it. if anything costco packages it, that i didn't ask but i was told diamond makes it for costco. susan http://www.sander-haus.com Home of Sander-Haus German Shepherd Dogs Quality West German Show Lines ============================================================================ 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 ============================================================================