Dunham had a role in The Mummy as Henderson. He played Peter on What I Like About You and Chad on True Jackson, VP. He was also known for his role as Charlie Thorpe in Hot Properties. He played Edward in DAG from 2000 to 2001. He also acted in dozens of other television shows and major films. He played Hunter Franklin on the short-lived sitcom Oh, Grow Up. More recently he appeared in Monster-in-Law (2005), The Bill Engvall Show (2007) and had an appearance in Get Smart (2008). In 2011, he appeared on Hot in Cleveland, playing an Amish bartender, and in 2012, he had a role in Paranormal Activity 4 alongside his real life wife Alexondra Lee as Doug Nelson.