A native of Sydney, Dowsett first came to prominence playing for Northern Suburbs during the Shute Shield and a strong showing during the 2013 season saw him earn a place in the Extended Playing Squad for the 2014 Super Rugby season. He eventually made his Super Rugby debut on 25 April 2014 as a late substitute for Nic White as the Brumbies defeated the 41-23 in Canberra. He joined the NSW Country Eagles for the 2015 National Rugby Championship. In the 2015 Super Rugby season, Dowsett was a second-half substitute during the semi final defeat against the Hurricanes.