A service dog can help a Vet in many ways. Check out one of these organizations for more information.
Canines for Combat Veterans
Description: Application to request an assistant dog.
America's Vetdogs http://www.vetdogs.org/
Description: The VetDogs program was created so that America’s veterans would have their own K-9 corps and the chance to live with dignity and self-reliance once more. In addition to guide dogs, VetDogs will train and supply service dogs for veterans who have disabilities other than visual impairment.