Paw Encyclopaedia

The Paw Encyclopaedia is a book filled with paw prints of cats collected by Itachi Uchiha and Sasuke Uchiha in their youth. The paws in the encyclopaedia range from nimble house cats all the way to the Two-Tailed Monster Cat. It was originally a game Itachi conjured up to occupy Sasuke, who would often throw tantrums, while he bought weapons for the Uchiha Clan. At first Itachi didn't intend for the game to be serious, but Nekobaa later turned it into an actual book. The last paw print collected was that of Nekomata, which was obtained by Sasuke Uchiha.

Trivia

 * Hina stated that getting your paw print taken was as embarrassing as getting a human to take a picture naked.