* The Wisdom of Cats (2003)
* The Cat's Meow:A Celebration of the Human-Feline Bond (2004)
* Cat People:Why We Love Them and They Tolerate Us (2005)
* The Joy of Cats:A Collection of Wits, Wisdom, and Purring (2006)
* Jag kan ha Cheezburger? En guide för internetåldern (2007)
* LOLcats:The Book:The Original Book That Inspired the Internet Phenomenon (2008)
* The Purrrfect Cat:A Field Guide to Understanding Your Cat's Unique Personality (2009)
* The Zen of Cats:A Path to Enlightenment Through Feline Meditation (2011)
* The Art of the Cat:Celebrating the Artistry of Cats (2012)
Fiktion:
* The Cat's Pyjamas:A Novel of Suspense (2010)
* Katten som kom till jul (2012)
* Katten som visste för mycket (2014)
Barnböcker:
* Katten som räddade julen (2015)
* Katten som hittade ett hem (2017)
* Katten som gick vilse (2019)