BarkBox is known as one of the most popular pet boxes on the market, and it's not hard to understand why. Boxes are fun and exciting (for pups and parents!), the toys are top-quality, and the treats are all-natural. Plus, BarkBox lets you customize your box to fit your pup's needs, allergies, and preferences. There's even a satisfaction guarantee. With free shipping across the US, birthday bonuses, and flexible subscriptions, it's pretty clear that BarkBox is among the best.