The ISBN of Heart of a Dog is 978-0-8021-5059-2.
The ISBN of The Lost Dog is 9781741753394.
The ISBN of Dylan Dog is 1595822062.
The ISBN of The Good Dog is 9780689838248.
The ISBN of Desert of the Heart is 159493035X.
The ISBN of Tales from the Heart is 0871356511.
The ISBN of America by Heart is 9780062010964.
The ISBN of The Hellbound Heart is 0913165131.
The ISBN of My Traitor's Heart is 087113229X.
The ISBN of Dog Wizard is 978-0345377142.
The ISBN of Zulu Heart is 978-0446531221.
The ISBN of The Heart of a Warrior is 978-0061688676.
The ISBN of "The Heart of a Distant Forest" by Philip Margolin is 0449135416.