Recently we started taking our dogs to a dog park (Black labradane and hound huskie mix.) The lab has always been great just playing fetch all the time passionately and listens so well when you call him, but the other ran around barking crazy until we got an E bark training collar for him. He calmed his antics down however when it died he went back to barking all the time. Well in the past month the lab has started randomly jumping at other dogs. They are both excitable but the hound mix just runs barking and when other dogs get too near the lab he growls and jumps them randomly. More information, the hound huskie has always behaved like an alpha so I think 2 reasons for the aggression might have to do with the lab fetching and because of his chase mindset he attacks other dogs cause they are in way or maybe the hounds barking makes him nervous and causes the lab to bark. Just today he attacked a dog on the way in, one while in near the water dish, one when I took him out and again when I tried to take him back in. He stop his growling and jumping when I pull him back. I don't know what to do to fix the problem. any suggestions??