My name is George!

George will be three years old in July. I got him at 8 weeks old. Now he is around 120 lbs. We did puppy training classes when I first got him but around the 10th week of classes he started to become aggressive towards other dogs. The trainers told me to neuter him as soon as possible so I did but it did not change his behavior. I then sent him to a three week boarding/training facility and they recommend a shock collar. It helped for a short period of time.
I think George is over stimulated living in the city and needs a different environment. I only have a fenced front yard so he is constantly upset at everyone who walks by. He can be so sweet and cuddly at times but he is mostly always on guard ready to protect. I am devastated to be rehoming him but I keep reminding myself it is the best thing I can do for George at this point.