[1] On 19 November 2011 Cowan-Dickie made his debut for Exeter at the age of eighteen in a EPCR Challenge Cup game against Cavalieri Prato.
[2][3] He made his Premiership debut in 2014[4] and that same year was part of the side that beat Northampton Saints in the final of the Anglo-Welsh Cup.
[5] He has played more than a hundred games in the Premiership,[4] scoring a hat-trick against Harlequins[6] during the 2016–17 season which culminated in Exeter defeating Wasps in the final to win their first League title.
[21] On 15 August 2015, Cowan-Dickie made his senior international debut against France as a second-half substitute for Rob Webber in a warm-up match for the 2015 World Cup at Twickenham.
A knee injury sustained in early 2017 meant Cowan-Dickie missed out on touring Argentina in the Summer, but he returned to International Rugby in 2018 as he was called up by Eddie Jones to join the Six Nations training squad.
[31] In the World Cup final he was a second-half substitute for Jamie George as England were defeated by South Africa to finish runners-up.
[36] After a two year absence from the national team due to injury, including missing the 2023 Rugby World Cup, Cowan-Dickie returned to the England squad for the Autumn International series in October 2024.