Add this datapack to the game to make Repurposed Structures's overworld villages have a chance of a Pet Shop! You can find Cats, Wolves, Rabbits, Frogs, Foxes, Parrots, Tropical Fish, Puffer Fish, Tad Poles, and very rarely, Axolotl or Turtles in them! The workstation for villagers is included and the chest will have Domestication Innovation's petshop loot table as well.

Forge:

Domestication Innovation mod can be obtained from here: https://www.curseforge.com/minecraft/mc-mods/domestication-innovation

Repurposed Structures mod can be obtained from here: https://www.curseforge.com/minecraft/mc-mods/repurposed-structures

 

 

Note for people using CurseForge Launcher to download datapacks, use mods like Global Data & Resourcespacks to automatically load in downloaded datapacks without needing to manually move the datapacks from the resourcepack folder to the correct folders. 
https://www.curseforge.com/minecraft/mc-mods/drp-global-datapack