If I lived in the Dallas-Fortworth area I would join you. But I live in CA. So that's quite a drive. But you should get involved with a local animal rights group. Join
http://www.api4animals.com and
http://www.idausa.org and you'll find out who around you is involved.
Better yet, join the forums at
http://www.nopuppymills.com and you should be able to find local people who would protest with you. Everyone there is anti-petstore/puppymill. Or they would direct you to a local group maybe. Good luck.