German Shepherds reaction

Question
Hi, I have a 9 months young male German Shepherd, pure breed, and a very lovely fellow, but has couple of complexes for which I'm very concerned! First of all I want to tell you that it bites always, by playtime and when it is over excited, most of the time unexpected !!! Attacks mostly Garbage cleaners and motorcyclists on the street while going out for a walk ( twice a day ). Recently, what made me to look up for the solution via the Internet, was a confrontation with a much smaller female German Shepherd (7 months) where my dog was terrified from it and seek refuge behind me and even to run away from it. I am not for dog aggression, but at least want to raise a well trained dog in such cases to defend itself and us. I LOVE my dog a lot and can say like my children, and want it to be a Brave dog to keep its Dignity high and confident the way it looks ! I'll appreciate every help and aid that you can offer me. Thanks in advance!

Answer
Hi
You have a pack order problem with your dog. You need to enroll him in obedience classes asap. Good job walking him twice a day but put him at HEEL and make him stay there unless you give him a release word. He needs some serious exercise, needs to be running until he's panting heavily at least three times a week. Treadmills work if you can't do anything else. A good run,.playing a LONG heavy game of fetch etc. Trips to the dog park. Have lots of active type toys for him in the back yard, tether ball on a pole. tires hung from tree limbs, knotted ropes hung from tree limbs or clothes lines, several different sizes of balls from beach ball sizes to tennis balls. Change them out often. Give him kongs and other treat filled toys to exercise his brain. MOST important to get him into obedience and start really exercising him. Also type alpha dog boot camp into your web browser. Read and learn it's an excellent site to help you establish and maintain pack order in your home.
good luck
Cindi