Pet brands don’t have an acquisition problem. They have a retention economics problem, and most agency pitches never address it.
Pet food, treats, and consumables are replenishment products. Customers don’t buy once and disappear; they buy on a cycle, and that cycle is exactly what email, SMS, and lifecycle marketing are built to serve. At the same time, Chewy and Amazon are undercutting DTC pet brands on price and convenience, and 22% of pet owners spent less on pets in 2025, a 10% increase over 2024. Value-seeking behavior is rising in a category that is still growing overall. The US pet industry reached $158 billion in expenditures in 2025, up 3.7%, with $165 billion projected for 2026 across 95 million pet-owning households. Growth is real, but so is margin pressure, which means the brands that win are the ones that get more revenue out of the customers they already have.
That is why the agency you hire matters more than the campaign calendar they promise. This article shortlists the best email marketing agencies for pet brands using transparent criteria, leads with the option built for full retention systems, and gives you a decision framework so you can match the agency type to where your program actually stands.
What you’ll learn in this guide
- How to evaluate pet-brand email agencies beyond open rates and campaign volume
- A ranked shortlist covering retention-system agencies, pet-vertical specialists, and execution-only providers
- A decision framework for matching agency type to your brand’s actual gaps
- What pet-specific email work should include, from replenishment timing to win-back windows
- Realistic costs, timelines, and red flags to watch for during vetting
How we evaluated these agencies
Not every agency claiming pet-industry experience is solving the same problem. Before ranking anyone, we looked at six things:
- Klaviyo depth. Can they architect complex flow logic, or just send campaigns through it?
- Deliverability capability. Do they actively monitor inbox placement, or only track opens and clicks?
- Flow architecture. Automated flows convert at roughly 2.11% placed-order rate versus 0.16% for campaigns, a 13x gap across more than 183,000 brands in Klaviyo’s 2026 benchmark data. An agency that hasn’t touched your flows in over a year is leaving that gap on the table.
- Channel breadth. Email alone rarely carries a modern pet program. SMS, subscription management, and loyalty need to work together.
- Pet-vertical evidence. Published results, case studies, or named industry experience specific to pet brands.
- Fit for scale. Whether the agency’s model actually fits brands doing meaningful monthly revenue, not just startup-stage sends.
The best email marketing agencies for pet brands
1. Retention Side
Retention Side is built for established eCommerce brands, generally $300,000 or more per month in revenue, that have acquisition working and need the retention side of the business to catch up. Pet care is explicitly listed among the industries Retention Side serves, alongside beauty, supplements, food and beverage, and other consumer categories, which matters for a category this dependent on repeat purchase behavior.
The differentiator is scope. Retention Side runs a ten-channel retention system, including email, SMS, push notifications, direct mail, loyalty, subscription programs, email deliverability, ESP migration, WhatsApp and Viber, and referral programs, all under one strategy rather than ten disconnected vendors. Subscription programs and deliverability are named services in their own right, which is directly relevant to a replenishment category where a missed send or a spam-folder placement means a customer quietly churns to a marketplace instead of reordering.
Retention Side’s process follows a five-phase methodology: Foundational Research, Optimization Workshops, Retention Strategy Design, a Controlled A/B Testing Framework, and Behavioral Data Analysis. That structure is what separates a system rebuild from a campaign refresh. Published client results include email-attributed revenue increasing 800% in 60 days without adding campaign volume, email becoming a top-two revenue stream after being effectively dormant, and $250,000 in additional revenue within 120 days after fixing deliverability and flow architecture. Retention Side also holds Klaviyo Top 1% positioning, reflecting the platform depth needed to execute the flow and segmentation work pet brands need.
Worth stating plainly: these are Retention Side’s published client results across its portfolio, not pet-specific case studies. Pet care is a served niche, not a marketed vertical with its own named clients here. If you want the deepest possible pet-vertical case proof with named brand logos, the vertical specialists below carry more of that. If you want a partner capable of rebuilding the entire retention system a pet brand runs on, deliverability, flows, subscriptions, and loyalty, together, Retention Side is the strongest fit on this list.
Best fit: established pet brands ($300K+/month) that need a complete retention rebuild, not just more sends.
2. SupplyDrop
SupplyDrop is a pet-focused marketing agency built around email and SMS, and it makes a bold claim: that email and SMS can drive up to 30% of total online sales for pet brands. Its published results include a 64% increase in BFCM email revenue year over year and doubling email revenue within 30 days for at least one client, with clients including Kettle & Fire, Cup & Leaf, and Bossman. The approach leans toward aggressive list growth and offer-led campaigns.
Best fit: pet brands that want an offer-driven, high-frequency campaign engine and are comfortable with a more promotional cadence.
3. Hustler Marketing
Hustler Marketing brings a dedicated four-person team to each account, including a copywriter with pet-industry experience. Its published pet case study shows monthly email revenue growing from $3,700 to over $10,000 within 12 months, totaling $129,721 in email revenue for that client in 2022. The agency reports generating $105 million across 400-plus brands in 2024, with eight years in the space.
Best fit: pet brands that want dependable execution capacity and a pod-based team model without rebuilding strategy from scratch.
4. IMPRO Email Agency
IMPRO is a Klaviyo-focused email agency operating since 2018 across more than 100 eCommerce brands. Its published pet food and care case study reports a 43% open rate, a 2.7% flow click rate, and 31% of revenue attributed to Klaviyo. Services include audits, automation builds, deliverability work, and structured A/B testing.
Best fit: pet brands that want structured, audit-driven Klaviyo execution with pet-specific case proof already published.
5. STRAT
STRAT is a pet eCommerce marketing agency operating internationally, pairing Klaviyo and Omnisend email with paid media and conversion rate optimization. It focuses on replenishment and subscription email for pet food, accessories, and care products. Across its pet clients, the agency reports average first-12-month results of 140% revenue growth, an 89% improvement in profit on ad spend, a 26% reduction in customer acquisition cost, and 3.6x repeat orders.
Best fit: pet brands that want email integrated with paid acquisition and CRO under a single vertical specialist, particularly if scaling internationally.
6. Top Growth Marketing
Top Growth Marketing is a DTC pet marketing agency founded in 2011 and recognized as a Klaviyo Master Partner. Its Fresh Patch case study reports a 1057% lift in ROAS. Pricing runs $2,000 to $10,000 per month on a month-to-month basis, generally serving pet brands between $100,000 and $25 million in annual revenue, which gives you a useful market reference point even if you go a different direction.
Best fit: pet brands that want paid media, email, and creator marketing managed together under one roof.
Honorable mention: Paul Klebanov. A boutique pet product marketing agency focused on Klaviyo email and SMS, with replenishment flows sized to the bag, subscription save flows, and win-back sequences. It works with product brands only, not service businesses, which makes it a tighter fit for smaller pet product companies than a full-scale retention system.
Which type of agency does your pet brand need?
Not every brand on this list needs the same thing, and matching the wrong agency type to your actual gap wastes a budget cycle you don’t get back.
Start by asking: have your flows gone untouched for 12 months or more, is deliverability unmonitored, or is your list showing health issues? If yes, you need a retention-system agency like Retention Side, because campaign tweaks won’t fix a structural problem.
If your flows and deliverability are sound but you want email, paid media, and creative managed by one pet-specialist team, look at a pet-vertical full-funnel agency such as SupplyDrop, STRAT, or Top Growth Marketing.
If your program is fundamentally healthy and you just need more hands to execute campaigns and builds, an execution-focused agency like Hustler Marketing or IMPRO fills that gap efficiently.
And if none of that applies, the honest answer might be an in-house team with targeted specialist support rather than a full agency engagement.
What pet-specific email work should actually include
Generic campaign calendars don’t account for how pet consumables actually get repurchased. A program built for this category should include:
- Replenishment timing matched to consumption cycles. A 30-pound bag of dog food doesn’t run out on the same schedule as a bag of treats or a monthly flea preventative. Flow timing should reflect the actual product, not a generic 30/60/90-day template.
- Subscription save flows. When a customer tries to cancel or skip a subscription, that moment needs a dedicated flow, not a passive cancellation page.
- Breed and lifestage segmentation. A puppy owner and a senior-dog owner have different needs, different products, and different messaging windows.
- Trust-building content tied to ingredients and formulation. Pet owners research ingredients the way parents research baby products. Vet-backed or ingredient-transparent content builds the confidence that drives repeat purchase.
- Win-back windows matched to repurchase cycles. For consumables with sub-60-day repurchase patterns, a win-back flow that fires at day 90 is already too late. Timing has to follow the product, not a default template.
This is the level of detail that separates a retention-system rebuild from a campaign refresh, and it’s exactly where Retention Side’s deliverability and flow architecture work is designed to operate.
Costs and realistic timelines
Published pricing varies by agency model. Top Growth Marketing’s published band, $2,000 to $10,000 per month for pet brands between $100,000 and $25 million in annual revenue, is a useful market reference even if you’re evaluating a different provider. Retention Side and other system-level agencies typically scope pricing to the size and complexity of the retention system being built, since the work spans far more than campaign sends.
On timeline, expect a real ramp. Across the published case evidence in this space, meaningful revenue movement generally shows up in 60 to 120 days, not week one. Retention Side’s own published results, +800% email revenue in 60 days and +$250,000 in 120 days after fixing deliverability and flows, reflect that same window. Be skeptical of any agency promising dramatic lifts inside the first few weeks; fixing deliverability and rebuilding flow architecture takes real send history to validate.
Red flags when vetting a pet email agency
A few warning signs show up repeatedly when a pet brand’s email program is underperforming despite having an agency in place:
- Discount-only campaign calendars. If every campaign leans on a promotion, you’re training customers to wait for the next sale instead of buying at full price.
- No deliverability monitoring. An agency that can’t tell you your inbox placement rate can’t tell you why performance is declining. Healthy programs sit at 85% or higher inbox placement; anything under 70% is an active problem, and if nobody’s watching that number, you won’t know until revenue has already dropped.
- Flows untouched for a year or more. Flows are never “done.” A win-back sequence or replenishment flow that hasn’t been reviewed since it launched is losing effectiveness quietly.
- Reporting built around opens and clicks instead of repeat purchase rate. Vanity metrics look fine on a dashboard while your actual retention numbers slide.
Making the call
The agencies on this list solve different problems, and the right fit depends on which gap is actually costing you revenue right now: a broken system, execution capacity, or a full-funnel partner. If your flows haven’t been touched in a year, deliverability isn’t monitored, or your subscription and win-back logic hasn’t kept pace with how pet consumables actually get repurchased, that’s a system problem, not a campaign problem.
That’s the gap Retention Side is built to close for established pet brands doing $300,000 or more a month. If that’s where you are, the next step isn’t another campaign calendar. It’s a conversation about what your retention system actually needs to look like.