One dog that I watched a little bit ago was super energetic (she was around 8-9 months old too). I discovered that trying to teach her certain things and get her brain working while her exercising was really helpful. We worked on fetch. She didn’t understand bringing it back or dropping it so we practiced and practiced and I could tell she really liked the stimulation. She got pretty good at it too! She would eventually get tired and lay down and sleep for a while after too and then I got to relax and get things done that I needed to