McDonald first represented the United States in international competition as the alternate for the American team at the 2009 World Wheelchair Curling Championship.

He then represented the United States as third under skip Augusto Perez in the 2010 Winter Paralympics in Vancouver, where they finished fourth.

He skipped the United States team at the 2013 World Wheelchair Curling Championship, and led his team to a fourth-place finish after losing in the semifinal to Canada's Jim Armstrong and losing a tight game to China in the bronze medal game.

McDonald skipped the United States team at the 2014 Winter Paralympics, and finished tied for fifth after the round robin.

After some complications, he recovered and began to undergo rehabilitation in California, competing in various sports, including wheelchair basketball, swimming, and golf.