Free Sample of Rachael Ray Zero Grain Dog Food This post may contain affiliate links. Please see my full disclosure policy for details. January 28, 2014 28 Jan Pin0Share0TweetGoogle+0shares You can request a FREE sample of Rachael Ray Zero Grain dog food. You will also find some great coupons for Rachael Ray Pet Food on this same page! Quantities are limited to one per household, while supplies last.