Brilliant sport dog, big voice

My Sheltie is an agility champion and he earns every ribbon. His focus, speed, and responsiveness are remarkable. The challenge in daily life is the barking. He alerts to everything and his bark is sharp and carries. We have done extensive training and he is much better but cannot be considered quiet. In a rural setting this would be a non-issue. In our semi-detached house it required real work to manage.