A Doggo Book is an upgrade for a 7.75 Damage Sword that can be bought from the Miner. It can also be obtained from Super Uberdrops.
OBTAINING
A Doggo Book can be bought from the Miner NPC for 400,000 Coins and 30 Night Shards.
ABILITIES
When applied to a 7.75 Damage Sword, increases the damage by 0.387 (5%), totaling +8.137 damage.