A first-round pick (No. 15) by the Islanders in the 2013 NHL Draft, Pulock played four seasons with Brandon of the Western Hockey League, where he was among the top offensive defenseman.
He scored eight goals and 42 points in 63 games as a WHL rookie in 2010-11, leading Brandon's defense in scoring. Those numbers went up to 19 goals, 60 points and plus-33 in 2011-12, when Pulock was named to the WHL First All-Star Team for the Eastern Conference. Pulock scored 14 goals and 54 points in 61 games in 2012-13, then ended his junior hockey career with 23 goals and 63 points in 2013-14. He won All-Star honors each of his last three seasons.