He turned a dog into a gun
Nope. He actually turned a gun into a dog.
Lassoo
Further information: Lassoo and Inu Inu no Mi, Model: Dachshund
Babe has a dog called
Lassoo, which was originally a gun, but "ate" the Inu Inu no Mi, Model: Dachshund, a
Devil Fruit, and became a gun-dog. Lassoo shoots timed exploding baseballs that weigh as much as cannonballs, even when he sneezes (when he's first introduced, he has a cold). Mr. 4 then takes out his 4-ton baseball bat and hits the balls at his enemies, launching them at great velocity and accuracy at different angles. Due to the weight, the cannonballs cannot be thrown back by an opponent of normal strength.
https://onepiece.fandom.com/wiki/Babe#Lassoo
Even in Alabasta One Piece was low-key weird as fuck.