The utility test is for the veteran dog of several seasons of hunting and years of training. Most dogs start to mature at two to three years. Too much pressure at an early age risks loss of intensity, style and desire. Don't punish a promising young dog by pushing him, just because he's doing well. He could be three years old before his mind is ready for the demands of intense versatile steadiness.
Pups first hunting season is very important.
It builds desire that carries him through difficult situations in the field and marsh. He can make no mistakes. It's fun and full of folly. You can complete the training in the years to come. Raven, my three year old Brittany, thought his first season was a high speed run though the woods until a covey of bobwhites exploded as he ran past them.