Here are reliable places to buy premium pet food online in the U.S., grouped by type, with quick notes and links to verify features like autoship, fresh delivery, or same‑day pickup.

Large online pet retailers (big selection + autoship)

• Chewy — huge selection of premium brands, very popular Autoship (subscription) program and strong customer service/return policies. (petfoodprocessing.net)
• Amazon — wide selection (many premium brands) and Subscribe & Save for recurring orders. Good for bulk buys and fast shipping if you’re a Prime member. (us.amazon.com)
• Petco — broad premium selection, Repeat Delivery (subscription) and same‑day pickup/delivery options in many areas. (petco.com)
• PetSmart — large selection, Autoship/Repeat Delivery options and same‑day delivery in many locations. (petsmart.com)

Fresh / human‑grade / custom meal subscription services

• The Farmer’s Dog — vet‑formulated, gently cooked fresh meals delivered on a schedule. (thefarmersdog.com)
• Nom Nom — vet‑developed fresh meals with a trial and repeat delivery model. (nom.twhwp.com)
• Ollie, JustFoodForDogs and similar services — other well‑known fresh/human‑grade options that ship nationwide or via partner retailers. (shop.akc.org)

Specialty / natural / raw retailers

• Only Natural Pet and other natural‑product specialty shops — curated, natural and alternative‑format (air‑dried, freeze‑dried) premium foods. (onlynaturalpetshop.com)
• Frozen/freeze‑dried/raw brands (Stella & Chewy’s, Freshpet, etc.) — sold direct and through retailers like Petco, Chewy and PetSmart. (petco.com)

How to choose where to buy (quick practical tips)

• Use autoship/subscribe programs to save and never run out — Chewy, Petco, PetSmart and Amazon all offer recurring discounts and scheduling. (petfoodprocessing.net)
• For fresh/frozen meals, buy direct from the brand or from retailers that handle refrigerated shipping (The Farmer’s Dog, Nom Nom, JustFoodForDogs, Freshpet). (thefarmersdog.com)
• Check the label for AAFCO “complete and balanced” statements for dry/wet foods and consult your vet for medical or prescription diets. (aafco.org)
• Watch recalls and safety notices — keep an eye on the FDA recalls page and recall trackers (Petful, ASPCA) before buying unfamiliar brands. (fda.gov)
• Compare unit price (price per lb or oz), shipping costs, and whether returns or 100% satisfaction guarantees apply (helpful when trying premium/fresh diets). (articles.pangovet.com)

If you want, I can narrow this to: best options for dogs vs cats, fresh vs dry, raw diets, budget premium brands, or a short comparison (price + pros/cons) of 3–5 specific brands/stores.