There's a brand new dance based on an old phrase. It's called the Fat Dog and it will amaze!
— Ben Chang
Changing bears into "Fat Dogs".
In the study group's fifth year at Greendale, the Save Greendale Committee had to come up with a theme for the upcoming Mid-Term dance. Annie left the dance planning details to Jeff, Duncan, Shirley and Chang. Chang came up with the theme of "Bear down for Mid-Terms". The others rejected his idea at first but changed their minds when Chang began to cry. Neil eventually revealed that the source of Chang's inspiration was a news report about a recent bear attack at a child's birthday party. The committee quickly re-purposed all the bear decorations they completed into a new theme, "Fat Dog". Chang also created a song and dance to try and legitimize the phrase further. "Fat Dog" was first heard in the Season Five episode "Analysis of Cork-Based Networking."
A real life Wikipedia page about "Fat Dog" was created the next day after this episode aired in reference to Shirley and Duncan having created a Wikipedia page about the term on the show. The Wikipedia page was eventually removed with a redirect left behind to another article. The original page can be seen HERE.
The song "Fat Dog" is used as background music for a special feature on the Community The Complete Fifth Season DVD. It plays over a montage of outtakes of various episodes from Season Five.