I have seen where alot of people and Im not singling anyone in particular out has said there is always somewhere a dog can improve. If you hunt a dog until he is old enough to retire at some point he or she is going to stop improving. In most cases they will begin to fall off a little.
I want a dog to improve until it is retired......once retired it is no longer a "hunting dog"......it then becomes a yard dog/family member.......... If you relate that to people.....your employer doesn't expect you to fall off before you retire....he is paying you to work the same at 64 1/2 as he did the day you were hired......obviously you would hope to have moved up in the company......but you are expected to perform to the best of your ability until you retire. The same with a dog...... I expect a dog to perform to the best of it's ability until I feel it is time to retire it. Again this is my opinion.......