An example of this is a Whippet of mine who showed brilliantly as a puppy. As an adolescent, he became sour and obstinate in the ring for no apparent reason. To counter this attitude change, I discovered he enjoyed chasing a frisbee. It did not take long before he looked forward to showing, associating it with the fun that followed. We have found it easier to obedience train an older Whippet than a puppy or young adult.
Puppies have a great deal of energy and their attention span is short.
Adults are settled and can concentrate for a longer time. Also, an older adult is more appreciative of the attention. Since the Whippet has been selectively bred for the natural chasing instinct, this training is easy. The Whippet loves to run. Since this is a physical activity and your Whippet will seldom want to stop.