Rodger Dorsy is a goldfish.
After Janitor was caught off guard and asked by J.D. to hold his new goldfish, Janitor stood around waiting to yell an insult at J.D.. Because he waited for so long, he imagined the goldfish was talking to him. Although the fish's voice sounded oddly familiar to Janitor (a fact that he himself noted) he believed he was really being spoken to when the fish sang to him. When Dr. Kelso yelled at Janitor for just standing around, Janitor stated that he was waiting with Rodger Dorsey. Kelso remembered the name - it was an old army buddy of his who died in his arms in Vietnam. The goldfish's bowl broke when Janitor's hand cramped and he set the bowl on the ground and J.D. smashed it with a door. The goldfish's current whereabouts is unknown. ("My Fishbowl")