Scope: "Strollers" = wheeled, push (or tow) carriages for walking/transporting dogs and cats — jogging, everyday/mobility, bicycle-trailer-combo, and detachable travel-carrier types. Excludes pet-carriers-&-crates (sibling leaf, no wheels) and cages/kennels (sibling leaf).

Seed: Print-production-manager equivalent: the stroller's "max pet weight" headline (the spec sheet) means little next to the cabin's actual floor area (what comes off the line) — a dog under the weight cap can still not fit. Persona notices first: they'd check cabin L×W before the weight claim, same as checking actual sheet feed vs. nominal press capacity. Survives: became the cabin_floor_area_class facet and the why_experts_care note on max_pet_weight_capacity.

Sources:
[ibiyaya_grand_cruiser] https://us.ibiyaya.com/products/grand-cruiser-large-dog-stroller-4-wheel-dog-pram-for-large-breeds-senior-injured-pets — 4-wheel, 110 lb max pet weight, 33 lb product weight, air-fiber cushion, dual tethers, upright fold, 29x22in cabin — fetched excerpt
[ibiyaya_jetpaw] https://us.ibiyaya.com/products/jetpaw-3-in-one-pet-stroller-with-detachable-airline-approved-carrier — detachable in-cabin airline carrier, 16 lb max pet weight, 14.22 lb product weight, aluminum tri-fold, expandable +70% — fetched excerpt
[ibiyaya_minika] https://us.ibiyaya.com/products/minika-3-in-1-pet-stroller-system-foldable-dog-bicycle-trailer-soft-crate-kennel — bike-trailer combo, tow bar sold separately, 55 lb stroller-mode / 44 lb trailer-mode capacity, MOLLE webbing, EVA wheels — fetched excerpt
[ibiyaya_beast] https://us.ibiyaya.com/products/the-beast-pet-jogging-stroller-3-wheel-all-terrain-dog-cat-pram — 3-wheel jogging, PU all-terrain wheels, double brake, 55 lb capacity, fabric meets EN71-3 and SGS testing — fetched excerpt
[ibiyaya_tinker] https://us.ibiyaya.com/products/tinker-small-detachable-pet-stroller-compact-buggy-for-cats-small-dogs — compact detachable, 33 lb max pet weight, 16.98 lb product weight — fetched excerpt
[hpz_premium] https://hpzpetrover.com/product/hpz-pet-rover-premium-heavy-duty-dog-cat-pet-stroller/ — stainless steel + aluminum frame, 360° front swivel + rear brakes, suspension, 22 lb product weight — fetched excerpt
[hpz_run] https://hpzpetrover.com/product/hpz-pet-rover-run-performance-jogging-sports-stroller... — 3 air-filled tires, lockable front swivel, 50 lb capacity, 26 lb product weight, 2 tethers — fetched excerpt
[hpz_titan_hd] https://hpzpetrover.com/product/hpz-pet-rover-titan-hd-premium-super-sized-dog-cat-pet-stroller/ — 100 lb capacity, 32x20in cabin, access ramp, airless rubber wheels, 4 tethers, 30 lb product weight — fetched excerpt
[akc_stroller_guide] https://www.akc.org/expert-advice/lifestyle/dog-stroller-guide-and-top-picks/ — air-filled tires for pavement vs. sealed-bearing treaded wheels for grass/uneven terrain, D/O-ring tether, mesh ventilation, ~30 lb comfortable ceiling, use cases (senior/arthritic/injured/small-breed) — WebFetch summary
[en71_wikipedia] https://en.wikipedia.org/wiki/EN_71 — confirms EN 71-3 = "Specification for migration of certain elements" (toy-safety heavy-metal migration test), explaining what ibiyaya's claim actually tests — fetched excerpt

Branches:
stroller_type=jogging_running -> front_wheel_swivel_lock, suspension, handlebar_adjustability matter: ibiyaya_beast + hpz_run both pair 3 wheels with a lockable front swivel and air-filled/PU tires specifically for running.
stroller_type=bicycle_trailer_combo -> bike_trailer_compatibility matters, handlebar/jogging features stop mattering: ibiyaya_minika requires a separate tow bar and drops capacity in trailer mode (55→44 lb).
stroller_type=detachable_travel_carrier -> secondary_use_modes matters, suspension/trailer features stop mattering: ibiyaya_jetpaw and ibiyaya_tinker are built around a detachable airline carrier, not ride comfort.
stroller_type=everyday_walking_or_mobility -> entry_access, folding_mechanism matter: ibiyaya_grand_cruiser and hpz_titan_hd both lead with a fully-opening canopy or ramp for senior/injured pets, not jogging or travel features.
max_pet_weight_capacity=over_100_lb -> bike_trailer_compatibility becomes irrelevant: no researched product offers a 100lb+ bike-trailer mode (minika tops out at 44 lb towed).

Noise (spec-sheet rows left out): SKU/model code (internal, not buyer-facing) — all five ibiyaya pages. Packaging carton size (shipping dimension, not product fit) — all five ibiyaya pages. Folded dimensions as exact numbers (kept qualitatively via folding_mechanism instead of a numeric facet) — all five ibiyaya pages, both HPZ pages. Color variants (aesthetic, excluded) — hpz_run. Price (never a facet per rule) — all pages.

Corrections: reference kind values fixed to schema enum (specialist_review, standards_body); two cold_start_questions shortened to meet the 12-word cap and drop "do you want" preamble; one judgement claim trimmed to the 25-word cap; added ibiyaya_tinker as evidence on stroller_own_weight so every reference is cited.

Corrections (2026-10-26):
Removed the invalid max_pet_weight_capacity split branch (numeric facet, no values list, "over_100_lb" couldn't be a schema-valid `when`); its logic (no combo tows 100lb+) folded into bike_trailer_compatibility's why_experts_care instead.
Set max_pet_weight_capacity.range.min 15→16 lb to match the lowest cited source (JetPaw, 16 lbs); no source ever stated 15.
Softened bike_trailer_compatibility's why_experts_care to attribute the 55→44 lb drop explicitly to "the one researched combo" rather than implying a confirmed general pattern; no second bike-trailer-combo product was found to corroborate it.
Softened listing_field_hint on max_pet_weight_capacity, wheel_count, and stroller_own_weight to note confirmation is on brand DTC pages only, not verified on third-party marketplace listings.
Added vocabulary entry for "Polyurethane (PU) tire" (wheel_type value was used and evidenced but undefined).
Added full facet step_in_height (numeric, in, no range — only one of five ibiyaya spec tables states this row: grand_cruiser "ground to cabin floor 9 in"; a second source was sought via a fresh AKC-guide fetch and a second ibiyaya product fetch attempt, neither confirmed a second number, so no range was invented).
Added full facet unfolded_footprint_area (numeric, sq in, range 573-1242, 5 sources: jetpaw, tinker, minika, grand_cruiser, beast "Overall Dimension"/"Stroller Frame (Unfolded)" rows).
Added full facet washable_removable_lining (boolean, 4 sources: ibiyaya_beast "Removable liner Washable for easy cleaning", ibiyaya_jetpaw "removable washable pad", hpz_run "machine-washable carrier pads", hpz_titan_hd "removable, easy-to-clean interior lining").
Rejected the cold-weather-insulation coverage finding: refetched the live AKC guide (the cached file was only its search-results page) and confirmed the quote, but it is a one-line generic buyer-advice sentence, not a feature stated on any of the nine researched brand spec sheets/pages — adding a facet would mean inventing per-product values with zero product-level evidence, so no facet was added.