Overall Duke is a very well adjusted and great 6 month old boy, but he's developed a bad habit. After we 'meet' another dog, he gets excited and starts to bark at me, jump around, lunge at me, and try to pull out of his harness. I think he's mad he's not allowed to play with the dog longer. He can also act like this when we run - even a light jog across the street lately has been a trigger. I've tried the passive (turn away from him and ignore it), the positive (praise him when he doesn't do it), and he negative (grab him by the collar and 'bad dog'); nothing has worked. We live in an urban environment with a lot of dogs and he's been on leash since day 1. I will try to run him more off leash, but I work from home 3 days a week and he gets a lot of walks every day, so I don't think it is too much pent up energy.