Petco has opened its retail media network to outside brands, according to Digital Commerce 360 — a move that takes the pet retailer's ad business beyond vendors who simply sell products on Petco's shelves.

That's the headline fact. What comes with it, in terms of pricing, formats, or measurement partners, the announcement as reported doesn't say. And in retail media, those details are the whole story for practitioners deciding whether to shift budget.

Why does this matter for martech buyers?

Retail media networks have become the fastest-growing ad channel in retail, and pet care is a loyalty-heavy, replenishment-driven category — the kind of first-party purchase data advertisers want. Petco sits on troves of it: repeat buyers of food, medication, and supplies, many tied to its Vital Care membership program and in-store grooming and veterinary services.

Opening the network to outside — often called "non-endemic" — brands means advertisers who don't sell anything on Petco's site can now target its shoppers. Think insurance, travel, household goods. Classic playbook. Whether Petco has that depth of integration, or is simply selling onsite display, remains unstated.

What do we actually know?

Here's the sum of it:

• Petco has made its retail media network available to outside, non-endemic advertisers.
• The report comes via Digital Commerce 360.
• No launch date, pricing tiers, minimum spend, or named measurement partners appear in the reported details.

That last bullet matters. Retail media's persistent weakness is inconsistent measurement — every network reports its own version of performance, and comparison across networks stays messy. A network that opens to non-endemic demand without naming a clean-room or attribution partner is asking advertisers to take a lot on faith.

How does this fit the broader retail media push?

Petco isn't first here, and by a wide margin. Major retailers have spent the past several years converting their digital properties into ad businesses, and non-endemic expansion has become the standard second act once endemic inventory saturates. Amazon, Walmart, and others blazed this trail; mid-size retailers followed.

For Petco specifically, the timing reads as a margin play. Retail margins are thin, and media revenue carries far higher margins than selling pet food. Whether Petco's audience scale — large but not Amazon-large — supports competitive CPMs for non-endemic buyers is the open question. Smaller networks often discount heavily to win that budget. We don't know Petco's rates.

What should practitioners watch next?

If you're evaluating Petco's network for a client or brand, press for specifics before committing spend:

• Available formats: onsite search, display, offsite audiences, or in-store screens?
• Measurement: which attribution vendor, which clean room, what incrementality testing exists?
• Pricing: fixed CPMs, auction-based, or negotiated packages with minimums?
• Data access: can you activate Petco audiences in your own DSP, or only within Petco's walls?

None of those specifics surfaced in the initial report. Until they do, treat this as directional news — a real signal of Petco's ad-business ambitions, but not yet a line item in anyone's media plan.

The skeptics' summary: a pet retailer joining the retail media gold rush is a story. A retail media network you can actually buy, measure, and defend in a post-mortem? That story still needs its specifics.

We'll update as Petco releases format, pricing, and partner details.