We had a serious raccoon problem in Dallas (posted on here this spring). First exterminator did not work. We somehow got connected with this guy named Cory who not only addressed our raccoon issue competently, but also is hilarious and super knowledgeable. Plan to be home and talk to this guy for 30 minutes, he is a character. Could not recommend him any more. Not sure if he will come out to FW but I would not doubt it. He is worth a call. His business is called "Critter Git'r" but he does not have much of an online presence or website.
Cory
(972) 814-5327
ETA: He specifically talked to us about mouse/rat methods he uses. Apparently a lot of his business is helping clients after Orkin/ABC just use poison and do not seal up entry points. He is experienced in mice and rats as well.