As well as being the guitarist, Dunlop has also contributed several songs. "You Don't Know What I'm Like", "Ancient Train" (both featuring Dunlop on lead vocals), "Central Station" and "The Sea" (with Fran Healy taking lead vocals). For their band's latest album, Ode to J. Smith, Dunlop has contributed "Quite Free", which he co-wrote with Fran Healy and Dougie Payne. Also on Travis' fifth studio album he co-wrote "3 Times and You Lose" and "Big Chair".
Dunlop is known for the long fingernails on his right hand which he uses instead of picks, much like a flamenco guitarist. Dunlop is married to Jo Monaghan. In December 2005 the couple's first child, a son, was born, and is named Dylan Green Dunlop. The family currently resides in Liverpool.