The word "Collar" in the title refers to collaring, a ritual binding a submissive partner to a dominant partner as the latter's personal slave. "6" presumably refers to Mistress Sixx, one of the main characters in the webcomic.
- Main article: Strips
The first strip of the webcomic was published on January 4, 2009. Since then, new strips have been published regularly every Monday, Thirsday, and Friday.