Pro Tip: Wait for a sale. The game frequently drops to $19.99 during Nintendo's "Indie World" or "Pet Sale" events.
Use the eShop. Don't risk your $300 console to save $40 on a game that goes on sale every other month. Little Friends Dogs Cats Switch NSP -eShop-
Little Friends: Dogs & Cats is a game that's suitable for players of all ages, but it's particularly well-suited for: Pro Tip: Wait for a sale
If you own the base game via NSP download, you cannot legally install the DLC without purchasing it via the eShop. Little Friends Dogs Cats Switch NSP -eShop-