New pup is doing well, roughly 14 weeks. CBR female. When playing/training/working, whatever you want to call it at this age, she loses interest after about 6 or so retrieves. Other dogs I've had would fetch forever at this age. I didn't throw marks forever, put them up wanting more, which is hard to do with this one. I try to get her as fired up as I can and keep it going. Once she loses interest I'll do something else, nature walk/hike or whatever. She'll still run it down, mouth it a bit and then see a stick or piece of grass that seems more interesting. Plan is to keep it fun and not over do anything. Any other words of wisdom?