Dogs For Defense: Military Dog Training During World War II (Part 1)
A patriotic public donated dogs to be trained for military functions. In all, the military received nearly 20,000 dogs but made use of only approximately half of those available. The others were found, for a variety of reasons, to be unsuitable for their purposes and were returned to their owners.
The Quartermaster Remount Branch of the army administered the program and supplied service dogs to all branches of the military over the course of the war. Even the Navy and Coast Guard eventually made use of service dogs supplied by Dogs for Defense.