We just adopted a 6 year old springer who is the perfect pet for our small family except for one annoying habit; he is aggressive with other dogs. I like to run with him in the neighborhood but as the weather gets warmer and more folks come out with their pets he wears me out wanting to chase or aggressive barking at other dogs when we pass by, the later being particularly embarrassing. We dont understand it and this has always been a problem according to the previous owners and I want to emphasize again that he is as gentle as a lamb with the kids ages 4, 8, and 11. We would love to take him out with us on walks downtown and on a visit Two Bostons for a yummy treat but we cannot trust him to behave! Any suggestions?