Feherty turned professional in 1976 and spent most of his playing career in Europe, where he won five times and finished in the top ten twice in the European Tour's Order of Merit, placing tenth in 1989 and eighth in 1990. He spent 1994 and 1995 playing mainly on the PGA Tour in the U.S., and the best result on the tour was a second-place finish at the 1994 New England Classic. His combined career earnings exceeded $3 million. Feherty represented Ireland in international competition and captained the victorious 1990 Alfred Dunhill Cup team. Feherty played for Europe on the 1991 Ryder Cup team.