Aggression Need Help - Page 1

I need some help here

I have a 7 month old german shepherd. He has been socialized with other dogs since he was 9 weeks old. There have been no altercations with other dogs and he has been fine/playful around other dogs.

My neighbors brought home a mutt from the pound a few weeks ago and My dog hates him. The other dog got out while me and my boy were out front and the 2 got in to a fight. Luckily my dog listened well enough when I told him HERE he came to me.  The end result the mutt got a little scratch on the ear. The mutt seemed like he just wanted to play.
I have gotten my dog a harness and muzzle ( i know he would rip his throat out)  to try and work through this issue but no matter what I do he wants to literally kill him. I put my dog in a down stay. Every time the mutt is near he flips out so I put him back in a down stay but it doesn't last long.
Also
  Ever since the scuffle my dog barks and growls at every dog like he wants to fight them.

What do I need to do to get my dog back to being the happy playful dog he used to be?

I agree wholeheartedly with Mystere... get him into a training class and you should see a great improvement!
Good luck, keep us updated and continue being responsible :-) It's wonderful you came on asking for advice.
Stacy

By the way, a dog on a harness is harder to control than a dog on a collar. Although you do not want a dog pulling at the end of a collar because you may hurt his neck, the harness kind of empowers the dog, and you can't use the leash to correct him, only restrain him. A good choke collar, or pinch collar if he isn't listening would be better in my opinion. Also, a harness puts the dog in front of you. There is no way to correct the dog is he is in front of you.

 Thanks you all. I do have a pinch collar for him and he seems to respond alot better to that then anything.
I have another little issue that could end up major.
 Tonight my gsd and my other male dog were out front. I sat down to enjoy the evening and Tee my gsd stood next to me. my other male got close to me and Tee growled and snapped at him. I gave him a sharp no and walked away from Tee and went over and played with my other male. Is he being protective and claiming me by not allowing the other dog to get close or just playing? Was I right to walk away from him? if not how should I correct him. 
 This is the first time he's ever done anything like this to the other male. Tee was raised with him and plays with him all the time. In the house and back yard they are great together. 
I would never give up on him because I know he's a sweet dog. I want to nip these issues in the butt while he's still young. 
 Thanks for all your help.

Hmmm. To me that sounds like it just might make the older one jealous. I guess if I were you, I'd think about getting the older one neutered? 

 Thats the thing the older one is neutered and I plan on having Tee neutered when he's over a year old. Don't worry I don't plan on breeding him. I love my boy and he's a great beautiful dog but theres nothing about him that would make him breedable. I've read that having them neutered at a young age has an effect on their hips not developing normally.

No, I wouldn't have the younger one neutered. Didn't know the other one already was.  

I had a 10 month old female once who would do this. She would try to go in for the kill on my 6 week old shepherd puppy every time.. I was really freaked out at the time and called the Houston SPCA and talked to one of the animal behavorist. She told me that it sounded like Sheba was maturing and become very territorial and that she also sounded too dominant.  She told me that I needed to be more dominant, and gave me several examples how to do that. I had to be her boss about everything. She couldn't even walk out a door with out me telling her to do so. I always had to walk out first and then call her. When she would refuse to do this. I would have to pick her up like a suit case grabing the skin behind her neck and the skin on her hind and place her in the down position when she refused to do what I would say. It took a couple of hard work with training and me being dominant in all sitiations, so that she would'nt feel that it was her job. But it worked, I never had another problem with Sheba. Other when she was in the backyard and I wasn't out there, she still seemed very aggresive at anything that tried to come up to our fence, but I was fine with that ( I didn't want anyone near my fence anyway). She finally quit attacking other dogs. I could take her anywhere walking and she would ignore all other dogs and her and my puppy became wonder friends.