Sean Frain has been keeping, working, and breeding terriers for thirty-five years and is the author of over twenty books, including the best-selling "The Patterdale Terrier" (978-1-904057-57-4). He lives close to the Cumbrian border, where Patterdale terriers have been bred and worked for decades, and has carefully researched the bloodlines of working breeds of terrier and those who have bred them.