will spaying my female dog curb her "aggressive&

 
Will spaying my female dog curb her "aggressive" tendencies?
My boxer labrador mix is one year old. I have not had her spayed yet but have an appointment beginning of Feb. and will have it done then.

My question is about her behavior. She gets along with other dogs really well after she meets them, but if I am out on a walk or if she sees another dog from far away she goes nuts. She has a deep mean sounding growl and her hackles (hair) raise up and she is all stiff and tense. Is she just being protective?

Anyways, will she calm down when meeting/seeing other dogs after this surgery?
Spaying should change her aggressivieness . http://zoocrewkids.blogspot.com/
Surgery really doesn't guarantee anything, but I can tell her that her dominant tendencies will change a little bit. She won't have the urge to compete for anything aggressively. I think that, while you're at your vet (you should still spay her either way), talk to her/him about it.
The surgery would be beneficial, but it won't stop this behavior. A professional trainer is your best bet.
Not likely. She isn't being "protective", she's being reactive, and spaying isn't going to change that behavior. Keep your spay appointment and contact a trainer to help you work with her.
The instant you know the behavior is going to happen turn sharply and walk the other direction.
pets question and answers,www.5d2d.com

Be consistent.
Teach her 100% reliable sit/stay, down/stay using positive reinforcement.
These can be used when the behavior is going to happen.
Hire a private trainer to work with you and the dog.
Private training is cost effective because it is one on one training for a short period of time.
While spaying and neutering does reduce aggressive tendency's it will probably not totally eliminate the behavior since your dog is already a year old and has displayed the behavior all her life.Teach your dog to 'leave it' and take treats with you on walks, HAve her 'leave' other dogs and focus on you hopefully breaking the bad habit, or at least minimizing the severity of it.