The oldest memorial to War Dogs in the United States is at the Hartsdale (New York) Pet Cemetery. This memorial was dedicated in 1922 to War Dogs used in World War I.
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http://www.qmfound.com/K-9.htm
Returning War Dogs to Civilian Life
At the end of the war the Quartermaster Corps put into operation a plan for return of war dogs to their civilian owners. Dogs were sent to a reprocessing section for the purpose of rehabilitation for civilian life. Dogs were trained that every human was friendly and tested for such things as reaction to people riding around them on bicycles or placed in an area with a great amount of noise. Before return, each dog was given a final check by a veterinary officer. Shipment of the dog to the owner was made at government expense. Those dogs which the original owner did not desire were sold to the public by the Treasury Department with the assistance of Dogs for Defense. By early 1947 the return of all borrowed dogs was completed.
After Viet Nam the vast majority of the surviving dogs were treated like excess equipment,and left behind...to unknown fates...