Our 27 month old female yellow english lab has always been high energy. She comes from long lines of labs bred for field and agility (breeder doesn't do "pet" dogs). She's a sweetie in the house, but has a very strong drive for being outside and lots of exercise. She needs a LOT of exercise, which we provide daily. Walks don't come even close to cutting it - a lot of running around is needed. We live in a city, but have access to lots of off-leash parks where she gets taken twice daily, plus a group outing daily with a walker to a local beach off-leash area. When she was wee (4-6 months), she had some issues with obsessively eating dirt, wood chips, sticks, etc (eating, not just chewing). We eventually licked the eating issues, largely by giving her a different focus - fetching. The problem is she now completely obsessed with fetching. She doesn't care about playing with other dogs at the park. She's not possessive of her ball - she'll patiently sit and wait if another dog steals it, but she won't chase another dog for it/play the game. Literally all she cares about is running at full speed after the ball, fetching and repeating until she is completely pooped. Multiple sessions daily. I've tried engaging her with other games at the park - nope. I've tried leaving the ball at home, but she'll not engage and instead hunt down a park ball and bark at me if I won't throw it, or shop it around to all the other humans around. I started bringing a tug rope (my last lab loved tug at the park), and she'll sometimes play tug for a bit with another dog, but always loses interest and goes to find a park ball. If she can't find a park ball, she gets antsy and starts digging and eating dirt and wood chips, etc. instead of engaging in play with other dogs (chasing, wrestling). I'm kind of at wits end of how to balance her activities. She just won't engage in a balanced set of activities, and she if doesn't get exercised hard, she isn't happy and starts in on the neurotic activities, both at the park and at home. Besides her mental health, I don't think that she can run/slide/chase at the level she currently does without eventually injuring joints and soft tissues. Any ideas short of medication (lol)?