More and more agencies are starting to use females. The agency that I retired from was only using male dogs for many years, but because of the cost of and competition for good dogs, they are now starting to use females.
I think the trend to using females is really starting to pick up.
He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours faithful and true~ to the last beat of his heart. You owe it to him to be worthy of such devotion. ~unknown