help! dog aggresive - Page 1

I took my dog to the dog park yesterday and i had him on a lease knowing that he chases other timid dogs down. i brought him there the day before and everything went well, even off leash. When i first brought him in he was some what timid, but he did sniff others and allow petting from other people ( he always does). the next time i brought him in he eemed more confident with the other dogs, i allow him to meet them and then we worked on heeling and the other basic commands and he was doing great. he was very into it, i thimk its great that he can listen when there are so many distactions. later i dicide to let him off leash and work with him. at first he's doing great, i occasionally throw the ball for him when he was doing well. then one small boxer chases the ball behind him, my dog turns and sees little boxer and chases him down untill the ground and repeatedly bits him. Soo sad.  the last time i played ball with him their, when he thought about chasing i could call him and he would be coming back to me, no problem.

I'm not sure what he is thinking or how to deal with this problem. hes great on leash and sometimes off leash. the only problem is this dog aggresion.  I he trying to be domiate, then takes it to far. He still attacks when the other dog is really submiting.

i have another GSD who is dominat, he lets every other dog know to not mess with him, but he not ruthless, a snap or growth is all he does.

please help

How old is he?

one thing i can think of is that he has been attacked by other dogs when he was younger, pits and labs. Maybe he feels he must attack other young and weak dogs now.

i was at an off leash dog park. I truely believe it was not about the toy in his mouth. I believe it to be more of a lack of proper socialization with other dogs. It was not my fault, it my fathers dog, i just wanted to help.

all i want is him to be able to be civil around other dogs, he's great with people and loves children, he's just a pet, i do not need to train him in Schutzhund.

I have been training him by him self, at empty field and tennis courts too, for a very long time and does great, does what ever i ask, i just though some distraction while training would really test him.  he was only off leash in the off leash dog park when we were done training that was when i was throwing the ball.

bun bun, what yellow rose said is not only for schutzhund dogs but for GSD's in general.   Just because it's an off leash park does not mean you have to take the leash off.  If you truely don't think it was about the toy you have not met many GSD's, mine would not have tolerated another dog being preceived as coming after their ball.

It may have been as you said animules but he has done this a few times in the past where he just sees a dog far away, i meam far, and heel chase it down. but this was before i started to work with him. he has improved alot since then, except this one time and one time is enough.

i have seen GSD alot and most act my other GSD, where he stays by his owner and is only interested in his owner and ball.

I know i don't have to have him off leash, and i dont most of the time, but i thought he was ok with everyone at the time, my mistake + there were so many GSD's there too, just wanted him play like they were playing.