Free Dog Food: http://www.cesar.ca/
Free dog food http://mypuppy.ca/register.asp
Free dog Treat: http://www.turbotreats.com/
Dog Treats: http://www.bennybullys.com/samples.php
Free Dog Food Coupons: http://www.mypedigree.ca/site/en/Startsa
I'm in Canada so I'm not sure if they all work for the US. It's worth a try!
If you don't need the samples order them anyway and then give them to your local animal shelter or rescue! They'll love you for it!