He made two further appearances that month, including scoring two goals in the final match, a 3–3 draw at home to Gillingham on 26 April, thus giving Saints fans some indication of what was to come.
After the end of hostilities, Dominy returned to a full-time football career in 1919, and soon formed a formidable striking partnership with Bill Rawlings, as manager Jimmy McIntyre set about building a team for the future.
In Saints' final season in the Southern League, Dominy scored 20 goals (to Rawlings' 19), including a hat-trick in a 5–1 victory at home to Crystal Palace on 13 March 1919.
A year later, McIntyre had successfully guided Southampton into Division Two, finishing equal on points with Plymouth Argyle and taking the title on goal average, helped in no small manner by 5–0 victories over Southend United and Newport County, a 6–0 defeat of Charlton Athletic and an 8–0 hammering of Northampton Town on 24 December 1921 (which is still Saints' biggest win in the Football League).
The position was only part-time, but Dominy gave valuable assistance until the appointment of Bill Dodgin in January 1946 in time for the resumption of league football later that year.
After handing over the role of manager to Bill Dodgin, Dominy remained at The Dell, as chief steward at the Saints supporters club, thus maintaining strong links with Southampton until his death in 1974, aged 81.