Upon graduation, Arnold went on to have a successful career playing for multiple elite European leagues.
After that he played two years for the Allianz Swans Gmunden, where he scored 15.5 points per game in his last season.
[3] On June 19, 2015, he signed a one-year deal with Belgian club Belfius Mons-Hainaut.
On December 12, 2018, he has signed contract with Crailsheim Merlins of Germany's Basketball Bundesliga.
In May 2019, Arnold was officially released from the Merlins for poor attitude and inability to function after an elbow injury left him unable to shoot.