The connotation is that a "dog robber" will obtain what ever their superior wants by any means necessary, legal or otherwise.
James Garner played the part of a typical "dog robber" in the movie, "The Americanization of Emily."
by Donnie Gene Howard September 06, 2006
Military slang for aides of general officers.
Bill served as General B. Fuddle's dog robber while on post.
by Duckbutt August 23, 2005