

Darling was born in 1941 in Cincinnati, Ohio, to a large and close-knit family.

She is the author of Good Dog, Carl and the rest of the beloved Carl books, including Carl Goes Shopping, Carl’s Christmas, Carl’s Birthday and Carl’s Snowy Afternoon. In addition to the children and Rottweiler fanciers who have enjoyed them, the books have been found useful in teaching English as a second language, with Alzheimer's patients, and with children who are having difficulty learning to read. Carls Afternoon in the Park (1991) Carls Christmas (1990) Carl Goes Shopping (1989) Carls Birthday (1995) Carls Summer Vacation (2008) Carls Snowy. Alexandra Day is the pseudonym for Sandra Louise Woodward Darling. The board book versions of these stories are particularly popular. All but the first have been published by Farrar, Straus and Giroux. There have been fourteen "Carl" titles after the first.

Good Dog, Carl was published in 1985 and has been continually in print since that date. Alexandra Day is the pseudonym for Sandra Louise Woodward Darling. All of the books are mostly wordless, relying on the details of the illustrations to tell the stories. Good Dog, Carl is the eponymous name of the first of a series of children's picture books written and illustrated by Alexandra Day centering on a Rottweiler named Carl and a little girl named Madeleine, of whom he takes care.
