Here is a link to a Large Breed Rescue in TX
http://www.petfinder.org/shelters/TX287.html

Here is a Dobe rescue in TX
http://www.petfinder.org/shelters/TX287.html

Here is a dobe rescue in College Station, TX
http://www.petfinder.org/shelters/TX387.html

This one is called Second Chance Veterinary Rescue
http://www.petfinder.org/shelters/TX582.html

Dobie Haven, Inc, in Corpus Christie
http://www.petfinder.org/shelters/TX505.html

If you go to www.petfinder.com you can search your state for other Rescue's