|Animal||Dog (season 5)|
Cat (season 10)
|Hair color||Brown (season 5)|
Grayish-white (season 10)
|Complexion||Brown (season 5)|
Tanned cream (season 10)
|Residence||Westboro Apartments, Elwood City|
|Cartoon debut||"Francine Goes to War"|
In "Feeling Flush," he replaces the toilet lid Francine and Catherine broke. When Francine checks the water-usage meter for her apartment, he becomes suspicious that her family is using more than their fair share of water.
In his first appearance, Mr. Sanders was a dog depicted wearing a yellow shirt, blue overalls, and brown shoes, and carries tools around his waist.
However, he was completely redesigned in "Feeling Flush". In his appearance, he was a cat. He wore a turquoise vest and white undershirt with a blue tie. He also wore jeans and carried a set of keys, most likely to all of the rooms in the complex.