Have you ever had a dog that you considered aggressive towards other dogs? Have you ever been in the situation that when you are walking your dog you run into another dog and your normally calm dog turns into Cujo.
You usually tend to do a couple of things. Maybe when you see the dog approach you cross the road to avoid him or you may just stop walking your dog altogether.
Your dog’s actions are controlling your actions. So this can only mean one thing. Between you and your dog, your dog is the boss when it comes to your relationship. He is the one calling the shots not you.
Sure you have tried pulling on the leash, tried a different collar or even a harness, maybe you have even tried to entice him with treats to no avail.
You need to take back your rightful position in your pack. You need to be the leader not the follower you have become.
You see your dog as aggressive but he is also dominant. A dominant dog is only doing his job and that is to protect the pack even if you are the only other member of the pack. Anything that he deems a threat to himself and you he is going to react in protect mode, thus the aggression.