Feiss created the Cartoon Network original series, Cow and Chicken and its spin-off, I Am Weasel and in both series, Feiss directed every episode and also worked as a writer on some episodes. David Feiss has also done some work in comics. In early issues of his cousin Sam Kieth's comic book The Maxx, David showcased his work with The Crappon (which looks like the Warner Brothers frog mascot), Fred Flower and Uncle Italian Moose, which had a very similar style to Cow and Chicken (it is reprinted in The Maxx Volume 5).