Peter played 14 seasons with the Montreal Alouettes from 1968 to 1981. This tight end led the team in receiving throughout five seasons and is the franchise's all-time leader in TD catches; 2nd in receptions and yardage; 3rd in TDs scored and 5th in scoring. His play earned him All-Star honours in 1972, 1975 and 1976 and All-Canadian honours in 1972, 1973 and 1975. He played in six Grey Cup games, winning three. The Montreal franchise retired his number 74 in 1981. Dalla Riva was elected to the CFL Hall of Fame in 1993.