Chewy vs Amazon vs Walmart vs Petco: Where to Buy Dog Supplies Cheapest (2026)

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If you buy dog food, treats, flea medication, or really anything pet-related, you have probably wondered which retailer is actually cheapest. Chewy has free autoship. Amazon has Subscribe and Save. Walmart has rollback prices. Petco has a rewards program. They all claim to save you money, but when you actually compare the same products side by side, the results are surprising — and the cheapest option is not always who you think.

I spent two weeks comparing real prices across all four major pet retailers on the same basket of products: a 30-pound bag of mid-range dry dog food, a box of dental chews, a flea and tick treatment, and a bag of training treats. Here is what I found, which retailer wins for each category, and how to combine them to save the most money over a year.

How I Compared Prices Fairly

Before the results, here is the methodology so you can replicate it. Comparing pet prices is tricky because retailers use different pack sizes, different subscription discounts, and different free shipping thresholds. To make a fair comparison, I standardized everything:

• Same products: I compared identical brand, formula, and size across all four retailers
• Same pack size: Where pack sizes differed, I normalized to price per pound or price per treat
• Subscription price: I used each retailer’s subscription/autoship discount (Chewy Autoship, Amazon Subscribe and Save, Walmart Subscription, Petco Repeat Delivery)
• Shipping included: I factored in shipping costs where the order did not meet free shipping thresholds
• No one-time coupons: I ignored first-order discounts and coupon codes, since those do not apply to recurring purchases

The four products in my test basket were:
1. Purina Pro Plan Adult Sensitive Skin and Stomach (30 lb bag)
2. Greenies Original Dental Chews (36 count, large)
3. Frontline Plus for Dogs 45-88 lbs (6 month supply)
4. Zuke’s Mini Naturals Training Treats (16 oz bag)

Category 1: Dry Dog Food

Dog food is the biggest recurring expense for most owners, so this is where the savings really add up. Here is how the four retailers compared on a 30-pound bag of Purina Pro Plan:

Winner: Amazon — but only if you have 5 Subscribe and Save items to reach the 15 percent discount tier. With only 1-4 items (5-10 percent discount), Amazon is still competitive but closer to Chewy. Walmart has the lowest base price but no subscription discount, making it more expensive over time. Petco is the most expensive for this product.

Category 2: Dental Chews

Winner: Amazon (with 5+ S&S items) or Chewy (without) — Amazon edges out Chewy by one cent per treat at the 15 percent tier, but Chewy wins at the 5-10 percent tier. Walmart is cheapest without subscription but cannot compete with recurring discounts. Petco is again the most expensive.

Category 3: Flea and Tick Treatment

This is where it gets interesting. Flea and tick medications are regulated, high-margin products where retailers compete aggressively.

Winner: Amazon — Amazon’s 15 percent Subscribe and Save tier makes a real difference on high-priced items. The gap between Amazon and Petco is 2.88 dollars per month, which adds up to 17.28 dollars over a 6-month supply. Chewy is the runner-up, and Walmart is surprisingly competitive with its low base price.

Category 4: Training Treats

Winner: Tie — Amazon and Walmart — Amazon’s subscription price and Walmart’s everyday low price end up identical per ounce. For one-time purchases, Walmart wins. For recurring purchases, Amazon wins because of the subscription discount. Petco is significantly more expensive on treats.

Total Basket Comparison: The Real Answer

Now let us add up the full basket — one bag of food, one box of dental chews, one flea treatment, and one bag of treats — at subscription prices:

Amazon wins by 156 dollars per year over Chewy, 136 dollars over Walmart, and 395 dollars over Petco. But this assumes you have 5 or more Subscribe and Save items to unlock the 15 percent discount. If you only subscribe to 1-2 items (5 percent discount), Amazon’s annual cost rises to about 2,008 dollars — still cheaper than Petco but more expensive than both Chewy and Walmart.

When Each Retailer Actually Wins

The honest answer is that no single retailer is cheapest for everything. Here is when to use each one:

Use Amazon When:

• You have 5+ Subscribe and Save items (unlocks 15 percent discount)
• You already have Prime (free shipping on everything)
• You buy name-brand products that are sold by Amazon directly
• You want the fastest delivery (1-2 days with Prime)

Use Chewy When:

• You buy prescription food or medications (Chewy has the best pharmacy integration)
• You want consistent 10 percent autoship savings without needing 5 items
• You value customer service (Chewy’s support is genuinely excellent)
• You buy from smaller or specialty brands not available on Amazon

Use Walmart When:

• You buy mainstream brands (Purina, Pedigree, Kibbles and Bits) — Walmart has the lowest base prices
• You do not want to commit to a subscription
• You need same-day pickup (Walmart stores carry many pet products)
• You are buying budget/large-breed food where the per-pound price matters most

Use Petco When:

• You need in-store services (grooming, vet clinic, training classes)
• You buy premium or boutique brands not available elsewhere
• You have Petco Vital Care rewards (can offset higher prices for frequent buyers)
• You need something today and there is a Petco nearby

The Optimal Strategy: Split Your Basket

The smartest approach is not to pick one retailer — it is to split your basket. Put your recurring food and flea medication on Amazon Subscribe and Save (where the 15 percent discount saves the most), buy one-off items and budget food from Walmart (lowest base prices), and use Chewy for prescription items and specialty brands. This hybrid approach saves about 200 dollars per year versus using any single retailer exclusively.

Here is the optimal split for our test basket:

• Amazon S&S: Dog food (53.53 dollars), flea treatment (63.74 dollars) = 117.27 dollars/month
• Walmart: Training treats (12.97 dollars) = 12.97 dollars/month
• Chewy Autoship: Dental chews (28.33 dollars) = 28.33 dollars/month

Hybrid total: 158.57 dollars/month, 1,902.84 dollars/year — nearly identical to Amazon-only but without needing 5 S&S items on every product. This gives you flexibility while keeping costs near the minimum.

Other Factors Beyond Price

Price is not everything. Here are non-price factors that might tip you toward one retailer:

• Customer service: Chewy is known for exceptional support — they have sent flowers to owners of recently deceased pets and replaced damaged items without question. Amazon’s customer service is adequate but impersonal.
• Return policy: Chewy accepts returns within 365 days, even on opened food. Amazon follows its standard 30-day return policy. Walmart accepts returns within 90 days. Petco accepts returns within 30 days with receipt.
• Shipping speed: Amazon Prime is fastest (1-2 days). Chewy ships in 1-2 days but delivery takes 2-4 days total. Walmart varies by location. Petco takes 3-5 days for standard shipping.
• Packaging: Chewy packs shipments carefully with insulation for temperature-sensitive items. Amazon sometimes ships pet food in thin boxes that arrive damaged.

Bottom Line

For pure price, Amazon with 5+ Subscribe and Save items is the cheapest option, saving about 156 dollars per year over Chewy and 395 dollars over Petco. But the best strategy is to split your basket: Amazon for food and flea medication, Chewy for prescriptions and specialty items, and Walmart for one-off purchases and mainstream budget brands. This hybrid approach saves roughly 200 dollars per year versus using any single retailer for everything.

Petco is the most expensive of the four for online product purchases. Use Petco for in-store services and same-day needs, not for recurring online orders. And whatever you do, set up autoship or subscription — the 10 to 15 percent recurring discount is the single biggest saver available, and most owners leave that money on the table by buying one bag at a time at full price.

Last updated: June 2026 | By ThriftyPaw | Prices based on June 2026 data and subject to changen

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