Unlike his son, Dr. Abbott is a normal-sized human.
Dr. Abbott had only one appearance, “The Yada Yada”, where he appeared at his son's wedding. Jerry greets him, “Hi, Mr. Abbott.” Dr. Abbott corrects him and says, “That’s DOCTOR Abbott, D.D.S. Tim Whatley was one of my students, and if this wasn’t my son’s wedding day, I’d knock your teeth out, you anti-dentite bastard.”
Robert Wagner, who portrayed Number Two in Austin Powers: International Man of Mystery, portrayed Dr. Abbott.