The dogcow, also known as Clarus the Dogcow, is a bitmapped image first introduced by Apple. It is the shape of a dog, originally created in 1983 as part of the Cairo font by Susan Kare as the glyph for “z.” That image was later chosen for the Mac OS Print Setup dialog box, though it needed to be slightly redrawn because the original Cairo dog did not proportionally fit the Print Setup dialog box. This modified version became the image famously known as the dogcow.[1]
The term “dogcow” was first coined by either Scott Zimmerman or Ginger Jernigan.[1] Mark “The Red” Harlan named the dogcow “Clarus” as a joking reference to Apple’s former office-software unit, Claris.[1] The sound she makes is “Moof!”
The image of the dogcow was used to show the orientation and color of the paper in Mac OS page setup dialog boxes. HCI engineer Annette Wagner made the decision to use the dog from the Cairo font as a starting point for the page graphic. Annette edited the original font and created a larger version with spots more suitable for demonstrating various printing options. The new dog graphic had a more bovine look, making it arguably less clear as to what animal it was intended to be, and after the print dialog was released the name “dogcow” came into use.
Apple Technote 31 includes a description of the dogcow.[2]