Dottin became a cornet in the 2nd Life Guards in 1791, and was promoted to captain in 1794. In 1795, he was cited in the divorce case of William Townshend Mullins and his second wife, Frances.[5]
In politics
In 1818, Dottin, a Tory, entered Parliament for the rotten borough of Gatton. He failed to be elected in 1820 at Southampton, despite heavy expenditure. In 1826 he was returned there unopposed, and again in 1830. In 1831, he did not stand, for health reasons. Re-elected in 1835, in a contested election, he remained in Parliament until he retired in 1841.[5]
Railway director
Dottin was one of the founders of the Southampton and London Railway and Dock Company, in 1831, with George Walter, and Robert Johnston, from Jamaica and a relation. The company failed.[6][7]George Thomas Landmann in October 1831 brought Walter into planning for the London and Greenwich Railway, and an initial meeting was held in Dottin's house in Argyle Street, London.[6] He was chairman of the company when it opened in 1836.[8] In July 1837, Dottin and Walter resigned as directors.[9]
Bugle Hall, Southampton, sold by Abel Rous Dottin in 1844
Dottin received compensation for the Coverley estate in Barbados, under the Slave Compensation Act 1837;[11] he had disposed of the Scotland plantation, also called Greenland(s), by 1823, when it was owned by John Rycroft Best. He died in Argyle Street, London on 17 June 1852.[5]