[Rottlva]

I agree with all of the above, but I have a wee bit to add.

You mentioned this boy is being labled as "reactive". It is often the smartest, quickest dogs that are labled as "reactive". They lack impulse control, are super sensitve to stimuli, and in the right hands can become fantastic competitors, but they are alot of work! Having my own "reactive" dog, I have learned alot. The most important thing is reactive behavior does not merit an excited response, or the behavior heightens. With my reactive dog, I've utilized the clicker for alot of things, because it is an emotionless tool. My voice can signal excitement, my voice can signal trepidation. I've used the clicker to shape an "auto watch" when in the prescence of overstimulating things: other dogs, skateboards, etc. I've used a clicker to tone down mouthing on dumbells as any change in my voice signaling something happy would increase the mouthing, I've used the clicker when teaching hand signals in absence of my voice.

All that being said, I think that yelling may have it's place, however, I bet snapping a leash on this fresh youngster, quieting your body language, and asking for a sit might have worked. Often reactive dogs do a certain behavior because it works for them. Finding them something else to do, a watch instead of lunging at passerby, a sit instead of jumping, whatever, is starting to change the behavior into one which you find acceptable.

Chin up. You'll get there with this boy!