1. Start with the frame
The frame determines almost everything: weight capacity, folding behaviour and long-term durability. Ask the supplier specifically:
- Material: steel (heavy, cheap, very rigid), aluminium alloy (light, corrosion-resistant) or a hybrid. For senior-dog and travel models, aluminium is usually worth the premium.
- Weight rating: a responsible supplier states the maximum load per deck — and it should be tested, not estimated. A "large-capacity" stroller rated under 15 kg is not a large-capacity stroller.
- Folding mechanism: one-hand fold is what end consumers ask for. If the supplier cannot demonstrate a one-hand fold on video, assume the mechanism is dated.
2. Wheels decide the customer experience
Buyers often compare fabric colours, but end users judge a stroller by its wheels. Check whether the supplier offers EVA foam wheels (quiet, never need inflation) and whether suspension is available on at least one model. Four-wheel suspension is a genuine selling point for senior dogs and post-surgery pets — it commands a higher retail price and justifies itself easily in product listings.
3. Fabrics and zips: where cheap products fail
The cabin fabric should be 600D oxford or better, with a waterproof coating rated clearly (not just "waterproof"). Ask for the exact denier and coating spec in writing. Zips are the number-one failure point reported in reviews — oversized, two-way zips with fabric guards are the spec you want. A supplier who cannot name their zip supplier is a supplier who buys whatever is cheapest that week.
4. Ask for the test report, not the certificate photo
Many suppliers show a certificate image that may or may not belong to the model you are buying. Instead, ask:
- Which standards were tested (e.g. REACH for the EU market, CA Prop 65 awareness for California)?
- Whether the report covers the exact model or only the product family.
- Whether they will put the test clauses into your purchase contract.
A factory willing to contractually commit to test clauses is a factory that expects to pass them.
5. Order the sample — and test it like a customer
Always buy a sample before committing, even at low volumes. Then use it the way a customer would: fold and unfold it fifty times, push it over a curb with 10 kg of weight inside, hose the canopy, and open and close every zip. This one afternoon of testing tells you more than any product page.
A good supplier will encourage sample testing. A supplier who pushes you to skip the sample and go straight to volume is telling you something.
6. Check the OEM/ODM depth
If you plan to build a brand, ask what the supplier customises in-house versus subcontracts: logo printing, woven labels, swing tags, colour of fabric and frame, packaging design. In-house capability means faster samples and better cost control. At Anshu Pet, for example, OEM/ODM branding covers product bodies, labels, packaging and instruction cards, confirmed on a physical sample before mass production.
7. Red flags that predict after-sales trouble
- Prices far below market with no explanation of what was removed to hit the price.
- No stated weight rating, or the same rating for every model in the catalogue.
- Reluctance to send a sample of the exact SKU you asked about.
- Communication that takes days per reply — you will feel this during a quality dispute, not just before the order.
The short version
Frame material and tested weight rating, wheel quality, fabric spec in writing, contractual test commitments, a sample you abuse on purpose, and honest communication speed. Suppliers who pass all six checks are rare — and worth building a long-term relationship with.