what in the heck this dog would do if I wasn't there to stop him? Nice dog. Smart. Not one shred of destruction when home alone. Has even done a little bit of therapy work at nursing homes. Three nice walks a day and not lacking in attention. But jeez-louise ... diesel trucks, buses, garbage trucks pass and I'm barely able to contain his 70+ lbs straining on the harness. I have worked on distracting him w/treats if I am able to see the "enemy" coming, turning and going another direction, etc. but more often than not, the bus or truck just happens upon us and there's no way I can get away fast enough. It takes everything I've got sometimes - and I'm pretty strong - to manage him while he's lunging. It just happened again today on his lunch walk and I was so goshdarn aggravated at how reactive he was. And any clues as to how this may have originated? He was a rural stray, about 4 yrs old now, I've only had him ~6 mos., do you figure he was tied out with this being his only source of ... ?? Someone give me some clues, some insight ... PLEASE!!