Funny you should ask this. I just sent an email off to someone else about Rottie vets in the Dallas area. Here are some of the ones recommended by folks in that area:
Dr. Andrea Komkov
Dr Ed Silverman, Uptown Vet Clinic
Animal Clinic of Farmers Branch
Dr. Steinle at the Northwest Animal Hospital
Duane Maxwell at Trinity Pet Hospital, Carrollton, TX
Bob Beardon of Mercedes Place Animal Hospital in Benbrook, TX
Frankford Pet Hospital, Carrollton, TX
I have ph numbers for 2 of them, but I didn't think it would be appropriate to post them here. Just so you know, I've never used any of these vets as I do not live that close to Dallas, so I can't personally recommend one particular vet over the other. Hope you find one that you and Cain like!
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Rachel aka rottie_mama
http://www.geocities.com/Petsburgh/7900