Petwell: Migrating 10,000+ SKUs from Magento to Shopify Plus in 8 Weeks

Petwell's migration was a continuity problem before it was a platform problem. The UK pet-health retailer needed to move a catalog of more than 10,000 SKUs from Magento to Shopify Plus while protecting the relationships between products, taxonomy, historical customer and order data, and the URLs search engines already knew.

According to Shopify's Partner Directory, the replatform was completed in 8 weeks, Petwell launched with zero downtime, and the full catalog moved with its integrity intact.

Project outcome	Recorded result
Source platform	Magento
Destination	Shopify Plus
Catalog migrated	10,000+ SKUs
Delivery window	8 weeks
Launch downtime	Zero
Historical continuity	Customer and order history migrated
SEO continuity	URL redirect mapping included
Catalog structure	Complex product taxonomy carried into the new operation

These are the recorded outcomes of this engagement. No revenue or conversion uplift is claimed here because those figures are not part of the verified project record.

The customer risk was not the data export

A catalog can be exported from Magento and imported into another system. That does not make the store migrated.

For Petwell, the useful parts of the existing operation extended beyond product titles and prices. A large pet-health catalog depends on category relationships, customer history, past orders, product availability, and URLs that may already rank or receive links. Those relationships are easy to flatten during a rushed replatform.

The business therefore faced several risks at once:

• more than 10,000 products had to remain correctly represented;
• a complex taxonomy had to make sense in Shopify rather than being copied blindly from Magento;
• customer and historical-order records needed to remain available to the team;
• old URLs needed intentional destinations so search traffic did not land on dead pages;
• the live store needed to keep accepting business until the new one was ready.

A successful launch had to preserve operational continuity while changing the commerce platform underneath it.

Why Shopify Plus was the destination

The objective was not to reproduce Magento screen for screen. It was to move the business onto Shopify Plus while retaining the information and workflows that still mattered.

That distinction is important in a replatform. Legacy systems accumulate structures for many reasons: old merchandising decisions, application limitations, historical category trees, custom fields, and one-off fixes. Copying all of them into the destination can preserve technical debt instead of preserving business value.

Shopify Plus offered Petwell a managed commerce foundation where the team could operate a large catalog without carrying the same infrastructure burden as Magento. But the value of the destination depended on the quality of the migration. Shopify could only be simpler to operate if the incoming catalog, taxonomy, history, and redirects were prepared deliberately.

Defining migration integrity before moving 10,000 products

For a small catalog, teams can catch many mistakes visually. At 10,000+ SKUs, that approach does not scale.

The migration therefore had to be treated as a data system. Product records needed predictable mappings into Shopify, and exceptions had to be identified instead of silently imported.

The key question was not “Did 10,000 rows arrive?” It was “Can a customer and the internal team still understand what every important record means after the move?”

That includes:

• product identity;
• category placement;
• product relationships;
• customer records;
• historical orders;
• legacy URLs;
• the difference between active and obsolete information.

The Shopify Partner project record describes the final outcome as full catalog integrity intact. That is a stronger standard than a successful import count.

Reworking taxonomy for customer discovery

Pet-health catalogs can span many product types, species, brands, care needs, and repeat-purchase categories. A taxonomy that evolved inside Magento may not map cleanly to the way Shopify represents products and collections.

The migration therefore included complex product taxonomy as an explicit workstream.

For the customer, taxonomy is navigation. It determines whether a shopper can narrow a broad catalog into a relevant set without knowing an exact product name.

For the merchant, taxonomy is also an operating system. It influences collection rules, merchandising, internal reporting, and how new products are introduced later.

For search engines, it shapes crawl paths and the landing pages available for category demand.

The goal was not to preserve every historical label. It was to preserve the meaning customers and the business depended on, then express that meaning cleanly in Shopify Plus.

Customer and order history were part of the product experience

Historical data is often described as a back-office migration task. For an established retailer, it affects customer service directly.

Past orders can help a support team answer questions about a previous purchase, identify what a returning customer ordered, or understand an account relationship. Leaving that history trapped inside a retired Magento environment would have forced the business to maintain two sources of truth after launch.

Petwell's migration therefore included customer and order history as first-class data.

The customer benefit is subtle but important: changing the ecommerce platform should not make the brand forget the relationship that existed before the change.

Redirect mapping protected the demand already earned

Magento and Shopify do not use identical URL structures. A replatform therefore creates an SEO problem even when the product catalog itself remains the same.

If an old category or product URL has search visibility, links, bookmarks, or referral traffic, simply removing it creates a broken path. Sending every retired URL to the homepage is not much better because it discards the original intent.

Petwell's project included URL redirect mapping so legacy destinations could be paired with the closest valid Shopify equivalents.

For a 10,000+ SKU migration, redirects need the same level of discipline as product data. The highest-value paths should be known before cutover, not discovered after search traffic begins reaching 404 pages.

The goal was continuity of intent: customers and search engines arriving through an old route should still reach a useful destination in the new store.

Why the 8-week window required controlled parallel work

Shopify's Partner Directory records an eight-week delivery window.

That timeline is significant because the scope included more than a theme build. Catalog data, taxonomy, customer history, orders, redirects, and launch readiness all had to converge on the same cutover.

The way to compress a migration safely is not to postpone difficult work until launch week. It is to run related workstreams in parallel with clear dependencies.

For example, redirect mapping depends on knowing the destination structure. Taxonomy decisions affect collection behavior. Historical data needs validation before the old system becomes read-only. Launch QA needs realistic catalog data rather than placeholder products.

The schedule only works when those dependencies are resolved deliberately.

Zero downtime was an operating requirement

The project record states that Petwell went live with zero downtime.

That does not mean the two platforms were magically identical at every moment. It means the cutover was organized so customers did not need to wait for a maintenance window while the business changed commerce systems.

For an active retailer, that matters beyond lost orders. Downtime can interrupt paid campaigns, organic sessions, support workflows, feeds, and customer trust at the exact moment the new platform is being evaluated.

The launch therefore had to be treated as a business operation rather than a code deployment.

The new store needed to be ready before traffic moved. Catalog state, historical data, URLs, and storefront behavior had to be checked in advance. The cutover itself should be the final transition, not the moment when the team begins discovering whether the migration worked.

What “full catalog integrity” means in practice

The Shopify Partner profile describes the launch as retaining full catalog integrity. For a migration of this size, that phrase matters.

Integrity means more than product count. It means the important relationships and attributes survived well enough for the new operation to function coherently.

A useful post-migration check asks questions such as:

• Are active products present and purchasable?
• Do products appear in the right categories?
• Can customers navigate the assortment logically?
• Are historical customers and orders available where expected?
• Do important legacy URLs resolve to meaningful destinations?
• Does the Shopify catalog reflect the business rather than the quirks of the export format?

Those checks are what separate a data transfer from a replatform.

The measured outcome was continuity, not a fabricated growth percentage

Some case studies are strongest when they show an acquisition or conversion lift. Petwell's verified project record tells a different story, and it is worth preserving that distinction.

The recorded outcomes are operational:

10,000+ SKUs moved from Magento to Shopify Plus

The business changed platforms without reducing the project to a partial catalog or a staged subset of products.

Eight-week delivery

The catalog, taxonomy, historical data, redirects, and launch were coordinated inside a defined migration window.

Zero downtime at launch

Customers could continue using the store through the transition.

Full catalog integrity intact

The migration preserved the structure required for the catalog to remain usable after the move.

These are meaningful results for a replatform. We do not attach an unverified revenue, traffic, or conversion claim to them.

What changed for the Petwell team

The long-term value of the migration was a different operating foundation.

Instead of maintaining the ecommerce operation on Magento, the UK business could work from Shopify Plus with its large catalog, historical customer relationships, and core category structure carried forward.

The project also removed a common migration burden: keeping the old platform operational indefinitely simply because some important data or URL knowledge never made it across.

A cleaner transition gives the internal team one place to continue the next phase of merchandising, optimization, and growth.

What this case does and does not prove

This case demonstrates that a 10,000+ SKU Magento store with complex taxonomy and historical data can be moved to Shopify Plus inside an eight-week program and launched without downtime when the migration is managed as coordinated data, SEO, and cutover work.

It does not imply that every 10,000-SKU Magento migration should take eight weeks. Data quality, custom Magento extensions, ERP dependencies, markets, subscriptions, B2B requirements, checkout logic, and third-party integrations can materially change scope.

The transferable lesson is that catalog count is only one dimension of migration complexity. Taxonomy, history, URL equity, and the launch plan deserve the same attention.

What a similar merchant should establish before replatforming

Before committing to a Magento-to-Shopify timeline, an established retailer should be able to answer four questions:

1. Which catalog data is authoritative and which fields are legacy debt?
2. Which customer and order records must remain operationally accessible?
3. Which existing URLs carry meaningful search or referral value?
4. What must be true before traffic is allowed to move to the new store?

Petwell's eight-week migration succeeded around those continuity requirements. The platform changed; the business did not have to start over.