I suppose this falls somewhere between behavior and training. My lab Otis will be 2 in January. He's mostly well behaved and like most labs, mellow at home, but extremely energetic at the park. All of that is fine until he's not responding to commands. This happens about 99% of the time at the Lake dog park. Other dry parks, trail walking, backyard, etc he's mostly very responsive. Something about the water and the area around it at our closest park just sets him off. While he retrieves fine everywhere else, at the lake he turns everything into a game of keep away. My two issues with him are stealing other dog's balls and then not responding to come, leave it, drop it. And if he finds a giant log (the bigger the better) he'll sprint around with it proudly swinging it around wildly. I'm concerned that he's going to injure someone. A couple of weeks ago he stole another dogs ball, which was fine with the other owner, but he was not listening to me telling him to drop it, so he was misbehaving. I waited, ignored him until he let his guard down, and grabbed him by the collar. As I tried to grab the ball out of his mouth he accidentally bit me as he was readjusting his grip on the ball. My bad, should have reinforced the drop it and let him drop. And he was too amped up to release the ball. So after a week to let my wound repair, I got him back out for some training on a 30 ft leash. We went to two different parks, two days in a row and the difference was astounding. He was coming on command. dropping the ball, etc etc. The second day, we went to the Lake park where he has the most problems and he was amazing! Granted there were not that many dogs around and he had the swimming area to himself for a good 5-10 minutes. I made him sit stay and threw the ball in the water, made him wait, and let him go get it. When he got out of the water he didn't run away trying to lure a game of chase, he came when called and dropped the ball immediately on command. He didn't even do that thing where he releases the ball but then can't help himself if it rolls away and has to go pick it up. nope... I was like, WHO IS THIS DOG? I cannot believe how quickly he changed his behavior! Then I thought, he has been messing with me this whole time! lol. We're going to keep going to the lake park with the 30ft leash at strategic times to reinforce his behavior there. I want him to be able to play with sticks/logs (but only if its safe), and even have a good game of chase with other dogs, but not until I feel confident he will listen to commands when distracted. So my question is, roughly how long will it take training him with the 30ft leash, to get him to the point where I can feel like he will listen off leash?