Arnold played for both Western and Eastern Suburbs during his career. He had just the one season at Wests before joining Eastern Suburbs in 1938 where he played over 100 matches, remaining there till his retirement in 1949.
Arnold, a front-rower, had the reputation of being a hard no-nonsense forward. He was sent-off in Easts 1941 premiership defeat, But was a try scorer in Easts' 22-18 premiership victory over Balmain in 1945, sealing the victory with the only points, that day, Dick Dunn didn't score for East's in the match. Arnold was one of 4 captains Easts' were to use during the 1948 season.