1. Females are "generally" considered more protective of their family/people than the territory, but GSDs regardless of sex are still very protective of their homes and their owners.
2. You don't need to train them to do that. If you have a well bred GSD (one whose temperament hasn't been diluted through poor breeding practices) it will happen naturally. GSDs are by nature aloof toward strangers, and will bark at perceived intruders. In fact, you should train the dog to a) stop barking when you have 'verified' that there is no danger, and b) be social or at least indifferent once you have allowed a stranger home. The last thing you want is a dog that won't let ANYONE in your house, including your relatives or friends.
3. If you are looking for protection for your home, get an alarm system. A dog (any dog) will deter most intruders because they'd rather not deal with a barking dog. This goes double for a big mean-sounding dog. BUT if they are really determined, they will break in and shoot the dog. Some dogs will try to take down the intruder (and this is mostly genetic), others will not. But do you really want them to try? Frankly, if an intruder came, I'd hold my dog back. Let them take my stuff... I have insurance. But please don't hurt my dog!
2. You don't need to train them to do that. If you have a well bred GSD (one whose temperament hasn't been diluted through poor breeding practices) it will happen naturally. GSDs are by nature aloof toward strangers, and will bark at perceived intruders. In fact, you should train the dog to a) stop barking when you have 'verified' that there is no danger, and b) be social or at least indifferent once you have allowed a stranger home. The last thing you want is a dog that won't let ANYONE in your house, including your relatives or friends.
3. If you are looking for protection for your home, get an alarm system. A dog (any dog) will deter most intruders because they'd rather not deal with a barking dog. This goes double for a big mean-sounding dog. BUT if they are really determined, they will break in and shoot the dog. Some dogs will try to take down the intruder (and this is mostly genetic), others will not. But do you really want them to try? Frankly, if an intruder came, I'd hold my dog back. Let them take my stuff... I have insurance. But please don't hurt my dog!