The Fed stamp is not required to hunt dove, just waterfowl:
Migratory Bird Hunting and
Conservation Stamp
The law requires that each waterfowl hunter 16 years
of age and older must carry on his person a valid
Migratory Bird Hunting and Conservation Stamp, or
duck stamp, signed in ink across the face. A “Duck
Stamp” is not needed to hunt doves, coots, rails,
gallinules, snipe, or woodcock.