Hi this is my first time doing this so i am not sure how it all works. We found our dog on the side of the road near a reservation. He was about 4 months old, we think. It has now been 6 months since we have had him. He is wonderful with people and all the dogs we socialized him with when he was a puppy but just recently he has become aggressive or territoral when meeting strange dogs. I am not quiet sure what to do because we did socialize him but now he is not nice to other dogs he doesnt know. So guess my question is how do we socialize him but make sure he is acting the right way?