Published on Wednesday, January 20, 2010 by admin Is my female GSD in heat? How will I know? What do I do? Intact female dogs (dogs that have not been surgically spayed), and that are sexually mature are said to be in estrus, "in heat", or "in season", during their occasional "cycle" in preparation to breed and reproduce. Female German Shepherds, also called bitches, generally have their first heat cycle at around...