Chewy Ads, the pet retailer's retail media network launched in May 2023, has doubled its advertiser and campaign count between 2026 and last year, ...
Executive Summary
Chewy Ads has assembled the minimum viable transparency stack — clean room CRM matching, native iROAS, and hybrid AI buying — that makes budget reallocation away from Amazon and Walmart politically defensible inside large CPGs. The mechanism is comparability: Chewy's numbers now sit in the same measurement framework as the giants. CPG pet brands with mature CRM lists should initiate a Chewy Marketing Cloud pilot by July 2026 and present a comparable ROAS report in Q4 budget reviews before Q1 2027 allocations are set.
The Signal
Chewy Ads, the pet retailer's retail media network launched in May 2023, has doubled its advertiser and campaign count between 2026 and last year, and debuted three products at Global Pet Expo in March: Chewy Max, an objective-based AI buying tool; Chewy Marketing Cloud, a dual clean room suite for CRM matching and cross-channel measurement; and native incrementality measurement including iROAS. Head of Ads Frank Mulcahy is positioning Chewy as a data-transparent alternative to the opacity prevalent across most retail media networks, citing an $8 lifetime-value return per $1 invested, a 33% ad-click-to-sale conversion rate, and 50% new-to-brand engagement among ad-exposed shoppers. Chewy Max is designed to coexist with manual controls rather than replace them, directly addressing buy-side resistance to black-box automation.
What Changed
Brands advertising on Chewy can now match their own CRM data against Chewy's first-party pet-owner data inside a clean room, activate that matched audience off-site, and receive transparent incrementality measurement — including iROAS — without surrendering control to opaque automated buying. A second clean room enables custom cross-channel measurement. This combination of voluntary data transparency, external-stack compatibility, and hybrid AI-plus-manual buying did not exist as a unified offering on Chewy's platform before March 2026.
Why It Matters
The commercial implication that matters most here is competitive reallocation: Chewy has built the infrastructure for large CPG pet brands to justify moving budget toward a mid-tier network and away from the two or three giants that currently absorb most retail media spend by default. Clean room CRM matching plus native iROAS plus optional AI buying is the minimum viable transparency stack that sophisticated buy-side teams require before they can make that case internally. Chewy just assembled all three. What becomes obsolete is the retailer's leverage through measurement ambiguity. When a network controls the only available ROAS number, advertisers negotiate blind. Chewy Marketing Cloud hands dual clean rooms to buyers who were already running their own measurement anyway — the difference is they can now do it on Chewy's inventory rather than routing that attribution work through a third party that has no sight into Chewy's closed-loop data. The effect is that Chewy's performance numbers become comparable, and comparability is exactly what makes budget reallocation politically defensible inside large CPGs. The why behind the why is that Chewy is competing with networks that have structural scale advantages it will never match. Amazon Advertising has demand density. Walmart Connect has physical footprint. Chewy's only durable differentiation is the specificity and quality of its pet-owner data combined with a willingness to let brands actually use it. That's not altruism — it's the only viable acquisition strategy for an ad business at Chewy's scale. Mulcahy is essentially monetizing trust as a media product, and the brands who stand to gain most are the ones with strong CRM lists and the internal analytics capacity to exploit matched audiences. For smaller DTC pet brands lacking that infrastructure, the Chewy Max path offers a different but equally concrete ROI unlock.
Marketing Impact
media
Media buyers at large CPG pet brands now have a defensible internal case for reallocating budget to Chewy: iROAS, clean-room matched audiences, and hybrid AI-plus-manual controls eliminate the three standard objections. Expect Chewy to appear on formal RFP shortlists that previously defaulted to Amazon Advertising and Walmart Connect by scale alone.
martech
Chewy Marketing Cloud's dual clean room architecture is designed to slot into existing brand measurement stacks rather than displace them. Martech teams that have already deployed clean room infrastructure with Habu, InfoSum, or LiveRamp can extend those workflows to Chewy's closed-loop data without rebuilding attribution logic from scratch.
research
Native iROAS and CRM-matched audience reporting give brand analytics teams a Chewy-specific incrementality baseline that was previously unavailable. This enables apples-to-apples spend efficiency comparisons across retail media networks — the precondition for defensible budget reallocation decisions at the portfolio level.
ecommerce
The 33% ad-click-to-sale conversion rate and 50% new-to-brand engagement figures give ecommerce teams a performance benchmark to pressure-test against their own category data before committing budget, reducing the blind-test cost typically required to evaluate a mid-tier network.
The Exploit
Opportunity
CPG pet brands with mature CRM lists can now run a clean room match against Chewy's first-party data, activate matched audiences off-site, and validate incrementality via native iROAS — all within a single network. The practical capture: redirect 10–15% of retail media test budget to Chewy before Q3 2026 and build a comparable ROAS case that makes internal reallocation defensible by Q1 2027 planning cycles.
Risk
Chewy Ads remains a mid-tier network with unproven scale for upper-funnel objectives; incremental reach may disappoint brands accustomed to Amazon's demand density, and clean room onboarding complexity could consume analytics bandwidth.
The Move
Head of retail media investment at a top-five CPG pet brand should initiate a Chewy Marketing Cloud pilot by July 2026: match one CRM segment, run a controlled iROAS test through Q3, and present a comparable ROAS report alongside Amazon figures in Q4 budget reviews — before Q1 2027 allocations are set.
First-Mover Advantage
Gains
First movers lock in preferred advertiser positioning and direct access to Mulcahy's team before Chewy's self-serve tooling matures and differentiates by account tier rather than activation sophistication.
Risks
Chewy Ads remains a mid-tier network with unproven scale for upper-funnel objectives; incremental reach may disappoint brands accustomed to Amazon's demand density, and clean room onboarding complexity could consume analytics bandwidth.
Window
The transparency advantage holds roughly 12–18 months — until Amazon Advertising and Walmart Connect respond with comparable dual clean room offerings, which either company could ship inside a product cycle.
Winners & Losers
Winners↑
CPG pet brand in-house analytics and media teams
Clean room CRM matching plus native iROAS gives sophisticated internal teams the closed-loop data they previously had to approximate through third-party attribution workarounds. The mechanism is comparability: Chewy's numbers now sit in the same measurement framework as Amazon Advertising and Walmart Connect, making budget reallocation politically defensible at the CFO level. Teams with mature CRM lists should prioritise a matched-audience pilot in Q3 2026 before the network's early-adopter commercial terms tighten.
Mid-tier and vertical retail media networks pursuing differentiation
Chewy has demonstrated a replicable model: transparency plus hybrid automation as the competitive wedge against scale-advantaged giants. Networks with strong vertical data density — pet, baby, sports, home improvement — now have a tested playbook for converting that specificity into a measurable budget case. The strategic move is to accelerate clean room deployment and publish incrementality benchmarks before Chewy's approach becomes the expected standard rather than the differentiating one.
Clean room infrastructure and identity resolution vendors
Chewy Marketing Cloud's dual clean room architecture — one for CRM matching and off-site activation, one for cross-channel measurement — validates the clean room as the default data collaboration layer for mid-tier retail media networks, not just enterprise-scale ones. Vendors positioned to serve networks at Chewy's scale gain a new sales motion: package the transparency stack as a competitive acquisition tool, not just a compliance solution. Demand from second-tier networks looking to replicate Chewy's differentiation will accelerate through 2026 into 2027.
Small and mid-size DTC pet brands without in-house measurement infrastructure
Chewy Max's objective-based AI buying removes the analytical barrier that previously made sophisticated retail media activation inaccessible to brands without dedicated programmatic teams. The mechanism is abstraction: budget, product, and target return are sufficient inputs, with Chewy's system handling bid optimisation across onsite and offsite inventory. These brands should treat Chewy Max as a shortcut to incrementality data they can use to benchmark performance across their wider retail media mix.
Losers↓
Retail media networks that rely on measurement opacity for pricing power
Chewy has made the commercial logic of opacity explicit — if your ROAS numbers were strong, you'd publish them — and built a product suite that lets advertisers test that hypothesis directly. As Chewy's iROAS benchmarks circulate among buy-side analytics teams, networks whose self-reported metrics cannot survive clean room scrutiny face growing pressure to either open up or justify premium CPMs without the cover of closed measurement. The defensive play is voluntary incrementality disclosure, but networks that have built margin on ambiguity will resist until advertiser attrition forces the issue.
Fully automated, black-box retail media buying tools
Chewy Max's design premise — AI that runs alongside manual controls rather than replacing them — directly addresses the buy-side resistance that limits adoption of Performance Max-style tools across retail media. The Drum poll cited in Mulcahy's own positioning (78% of buy-side respondents wanting transparency or control before automation) quantifies the market Chewy Max is taking from tools that haven't resolved that objection. Vendors selling opaque objective-based buying now face a named competitor that has made hybrid control its primary feature, raising the bar for what buy-side teams will accept.
Strategic Outlook
Chewy's transparency stack will function as competitive pressure on the broader retail media market before it functions as a revenue windfall for Chewy itself. The pattern is familiar: when one mid-tier network publishes credible incrementality numbers and opens clean room access, it forces comparability onto networks that have been insulated from it. Expect at least two other specialty vertical networks — likely in health and beauty or home improvement — to accelerate clean room launches in Q3 and Q4 2026, citing buy-side demand. The larger networks will not match Chewy's transparency posture voluntarily, but they will face more pointed questions from sophisticated buyers who now have a reference point. Chewy's advertiser count doubling year-over-year is the number to watch: if it repeats through 2027, it validates the transparency-as-acquisition-strategy thesis and accelerates the barbell model's adoption across the mid-tier. The risk is execution — clean rooms are only as useful as the match rates they deliver.