The Jack Russell Book is an item in Nintendogs that falls under the category of "Etc." in the Supplies. It is a book about Jack Russell Terriers, and obtaining this allows the player to buy the breed at the Kennel. This item can be difficult to find, for it is extremely rare and can only be found on walks.
It is recommended to take a dog with high stamina to find this item. Despite its rarity, it sells for only $3.60 at the Secondhand Shop. Many dogs will play with the book rather than being scared of it. It can supposedly be found in the Forest or Beach Areas.