Dagmar Fehlau illustrated the 2001 Sesame Street book I Don't Want to Live on the Moon. She contributed regularly to Sesame Street Magazine between 2004 and 2005.

Much of Fehlau's illustration work has been for do-it-yourself books such as Making Herbal Dream Pillows, Making Bentwood Trellises, Arbors, Gates & Fences, and Creating Fairy Garden Fragrances. Children's book illustrations include Snowbear's Winter Day, Mother Goose and Her Animal Friends, and the early readers' book My Robot.