As a young player in the BCJHL Doug Berry had the ability to put the puck in the net, but it was his playmaking skills that was the strength of his game. He was known for his accurate passing and ability to find his linemates open down the wings. In his last year in the BCJHL he led the league with 103 assists to go along with 37 goals.
In 1975-76 Berry enrolled at the University of Denver where he played on the school team for three years. In the summer of 1977 he was selected in the third round, 38th overall in the NHL Amateur Draft by the Colorado Rockies. Upon leaving school after the 1977-78 season Berry decided to try his hand at the WHA, having also been selected by the Calgary Cowboys in 1977. However, with the Calgary franchise folded, Berry was a free agent and opted to sign with the Edmonton Oilers where he played for a year, before the WHA itself folded after the 1978-79 season.
Berry was re-claimed by Colorado in the 1979 NHL Expansion Draft where he played for a year-and-a-half. In 1981-82 Berry was presented with the opportunity to play in Germany, With the exception of one year in Switzerland, Berry played ten of his last eleven years in Germany, retiring after the 1991-92 season. Berry's younger brother Ken also played in the NHL with Edmonton and Vancouver.