german sheperd attacks

I wonder why my rottweiler dogs attacking other dogs? I do not understand why? HELP HELP?
Hello everyone I am deaf. when I went with my dog my home fincee his father .. a female German shepherd dog that my ticket .. play with her. when I with my dog not always walk and attack another dog bark and bite .. how different, how I have to stop? i am trying to use the water to stop pulling does not work. I'm trying to mouth that does not work. what I do?
You are not the leader of the pack. You have to go to obedience training your dog, you have to assert himself as the alpha of the pack. There are so many things that have to be in response help. Muzzle your dog and keep it at bay. when your dog shows signs that it is ready to attack another dog, using a quick correction adjustment the strap away from the other dog. In the same movement around and go the opposite direction. Stop, make your dog sit, then you can return to its original direction. when you see your dog, there are indications that it is thinking of attacking. that is, when you make the correction, when you are thinking about it. Obedience training is the best way to achieve your goals. It is also important for you to learn to be the leader of the pack. I wish you luck. You can email me if you wish. I can be able to provide some additional ideas.
Will the German Shepherd Attack the Yorkie?