There's two ways to get Ancient Coins: either through micropayments in the Pirate Emporium (a single pet will cost around five dollars), or by defeating Ancient Skeletons in the main game. | Joel Franey/USgamer, Rare/Xbox Game Studios How to Get Ancient Coins The pet shop is the only way to make an animal friend. At time of writing, the standard price for pets in Sea of Thieves is 499 Ancient Coins, as well as 249 Ancient Coins for each cosmetic pack.
If you have Ancient Coins, you can go to the Pirate Emporium in the main menu before you start a game, and one of the tabs at the top of the screen should say 'Pets.' Here you can buy whatever ones you want, as well as cosmetic clothing for the ones you have. If you want your own pet, right now there's only one way to do so: buy one using Sea of Thieves' 'Ancient Coins' in-game currency. Can I Put a Parrot or Other Pet On My Shoulder?.