I was adopted by Dan shortly before he blew up the animal shelter across the street from his apartment in Dan Vs. The Animal Shelter. I am an ideal companion for Dan and am often there for him after coming home from having a bad day (which is mostly everyday). Often times, my own presence can help calm Dan down and, at times, reduce the severity of whatever diabolic plan he has for sweet revenge. Dan is very protective of me, as seen in The Catburgular, as well as other episodes. He probably likes me more than Chris.
I play a major role in The Catburglar (episode) when I am kidnapped, but am rescued by Dan. On several occasions, I have been used by Dan in his revenge schemes and willingly aided him. When I assist, he will usually disguise me accordingly, such as with a ski mask or a cape when we became superheroes (calling me Mumblecat).