 Billy's early appearances for the Reds were sporadic but his loyalty and dedication paid off as he was to become a regular starter over a 10-year period which included the Anfield club's first ever Football League Championship win in 1901 a feat they, and he, were to repeat in 1906.Dunlop scored just twice for Liverpool his first coming on the 19 September 1903 in a 1-1 draw with Stoke at Anfield.Dunlop earned 1 international cap when he represented Scotland against England on 7 April 1906, a game Scotland won 2-1 in a British International Championship match at Hampden Park Glasgow.