At six months old you do not want him to be jumping up and catching anything... either chasing or catching. His bones are not grown and his growth plates are not yet closed. Let him grow up more. He might be avoiding the taking off ahead because it may be painful for him to jump and land.
Try rolling an appropriate size ball on the ground. Hold his collar and kick the ball.. holding him back.. then release him to chase it. At this age that is a safe exercise. Holding him back will build drive to chase the ball as he sees it rolling away. He should run faster after it if you do this. When he is older (over 14 months) go back to the frisbee.
Try rolling an appropriate size ball on the ground. Hold his collar and kick the ball.. holding him back.. then release him to chase it. At this age that is a safe exercise. Holding him back will build drive to chase the ball as he sees it rolling away. He should run faster after it if you do this. When he is older (over 14 months) go back to the frisbee.