She won a bronze medal competing for her country at the 1982 Commonwealth Games.

A member of the Wharenui Swimming Club in Christchurch specialising in breaststroke and individual medley, Dewar represented New Zealand at the 1982 Commonwealth Games in Brisbane.

[3][4][5] Swimming with Gail Jonson, Melanie Jones, and Pamela Croad in the women's 4×100 metres freestyle relay, she won a bronze medal.

[6] She also swam in the women's 4×100 metres medley relay, with Megan Tohill, Pamela Croad, and Ursula Cross, finishing fourth in the final.

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