Free Sample: Three Dog Bakery All Natural Dog Cookies June 2, 2010 at 1:05 pm by Cindy Livesey | Freebies 0 comments And another great Free sample from Walmart. This one is for Three Dog Bakery All Natural Dog Cookies. You can head over here to request your free sample. Coupons powered by Coupons.com The links in the post above may be affiliate links. Read the full disclosure.