I have two GSD's - an 18 month old female and a 9 month old male. The female is everything you'd expect from the breed - non stop energy, protective, alert, loving, etc. However I'm disappointed in the male's temperament. He's too shy, not very energetic and doesn't stick up for himself (for example if the female tries to take his toys he let's her do it without much of a fight). Usually he just wants to cuddle with people. What can I do to improve his energy, confidence and self respect?