Cat Island can be found in the middle of Lake Biwa in the Omi region in Assassin's Creed: Shadows. If you're having trouble finding it, explore the coastline west of Azuchi - you should be able to spot Cat Island from the shore!

Assassin’s Creed Shadows, like most modern open-world video games, features a large map filled with various animals, including horses, birds, foxes, rabbits, dogs, and cats. But unlike most other open-world games, even others from Ubisoft itself, you can’t kill any of these animals. Instead, you can only pet and collect some.

Unlocking an animal as a pet in Assassin's Creed Shadows is incredibly simple. When you see an animal in town or in the wild, walk up to them and you'll get a prompt to pet them. Once you pet them, an icon will flash up to tell you the species of the animal, which also confirms that you have unlocked them as a pet.