I have a frisbee obsessed girl as well, (I'm rather paranoid about it, so I always try to keep those throws low and straight, no skidding and no high jumping just me being paranoid).
Anyhow, he's young so he's probably just amped up and not learning any impulse control when it comes to the frisbee.
Two frisbees work well,throw one, pick up the other. I've worked long and hard to get masi, to learn "patience and control" when it comes to a frisbee,,If she doesn't 'drop it', it doesn't get thrown, if she doesn't "out' it, it doesn't get thrown,,
For instance, I also will have her sit/down STAY and not move even when i throw the frisbee until I say so, or put the frisbee in front of her, and "no touch" until I release her...You can see the eyes bulging out of her head, cause she is ALL about that frisbee, but she does it..
Keep in mind Masi is 3 years old, at 7 mths she was most likely fighting me the whole way about giving up that darn frisbee
) Also I do not let her drag her frisbee around all day,,frisbee time is just that frisbee time..