He practised law in Cassiar and Nanaimo before settling in Victoria and becoming a leading criminal lawyer.

He was the brother of Alexander Edmund Batson Davie, who served as premier of British Columbia from 1887 to 1889.

Davie's government passed a Redistribution Bill to give the mainland of the province greater representation in the legislature.

The Davie government also approved the construction of the province's parliament buildings in Victoria despite pressure to move the capital to the mainland.

Theodore Davie is interred in the Ross Bay Cemetery in Victoria, British Columbia.