Buying pet medications online typically saves 20–40% compared to your vet's office. But the experience isn't identical across pharmacies — pricing, catalog depth, and prescription handling all vary. Here's how the main options compare.
Chewy Pharmacy
Chewy is the largest online pet retailer in the US, and their pharmacy reflects it. They carry the broadest selection, process prescriptions quickly, and their autoship discounts (5–35% depending on the product) are the most aggressive in the space. Shipping is fast — most orders arrive in 1–2 days.
The tradeoff is that their website is a lot to navigate, and a handful of specialty medications aren't available. For common prescriptions like Heartgard, NexGard, or Bravecto, Chewy is the best starting point for most people.
Petco Pharmacy
Petco's pharmacy is worth checking if you're already a Vital Care member — the loyalty program stacks savings on pharmacy orders in a way that can make Petco cheaper than Chewy on specific items even if the base price is higher. They also offer in-store pickup, which is handy if you need something same-day.
Outside of Vital Care perks, their catalog is smaller and base prices generally run slightly above Chewy. It's not the first place to look, but it's worth a quick comparison before you check out.
1800PetMeds
1800PetMeds has been around longer than most online pet pharmacies and is licensed in all 50 states. Their catalog is deep — they stock a lot of specialty medications that Chewy and Petco don't carry. The prescription process is straightforward, though autoship discounts are less competitive.
If your pet is on something unusual or compounded, 1800PetMeds is often where to look when the bigger retailers come up empty.
What you'll need to order
Any licensed online pharmacy will ask for a valid prescription before dispensing. You can usually upload a photo, provide your vet's fax number for them to request it directly, or give the clinic's phone number so they can call to verify. Processing takes 1–2 business days if they're reaching out to your vet; same day if you upload the document yourself.
You'll also need your pet's species, weight, and age — standard info most pet owners know off the top of their head.
How to pick
For everyday medications, check PetSaver first. Promotions change constantly and the cheapest option on any given day isn't always the same pharmacy. For specialty or compounded medications, start with 1800PetMeds. For the best autoship deal, Chewy usually wins.