Scope: "Collars, Harnesses & Leashes" (supplies > pets > collars) covers walking/restraint gear worn on or held with a dog or cat: collars, harnesses, and leashes, bundled as three product types each with their own facet set. Excludes electronic training collars/bark collars (-> training-behavior leaf), ID tags/charms (-> pet-tags leaf), flea collars and Elizabethan/cone collars (-> pet-medical-supplies leaf), and clothing (-> pet-apparel leaf).

Seed: 1. The collars equivalent of "weave, not thread count" is collar/harness TYPE and clip position (martingale vs flat, front-clip vs back-clip), not the neck/chest size number every listing leads with. 2. A sommelier-persona buyer would notice material PROCESS first: biothane is coated webbing (PVC/TPU over polyester) that never absorbs water or odor the way plain nylon or leather does, and leather needs conditioning/break-in — a process distinction retail titles never surface.

Sources:
[wikipedia_dog_collar] https://en.wikipedia.org/wiki/Dog_collar — flat/martingale/head-halter/prong/choke/breakaway collar types, two-finger fit rule — fetched excerpt
[wikipedia_leash] https://en.wikipedia.org/wiki/Leash — standard 4-6ft leash length, retractable 15-25ft and injury link — fetched excerpt
[wikipedia_dog_harness] https://en.wikipedia.org/wiki/Dog_harness — harness spreads pull off the trachea, chest/Y/no-pull/sled/service styles — fetched excerpt
[wikipedia_cat_collar] https://en.wikipedia.org/wiki/Cat_collar — buckle/elastic/breakaway closures, breakaway-safety debate (2010 study vs vet orgs) — fetched excerpt
[akc_harness_guide] https://www.akc.org/expert-advice/lifestyle/best-dog-harnesses/ — front-clip leverage, martingale=limited-slip, one/two-finger fit rule — fetched excerpt
[ruffwear_front_range_harness] https://ruffwear.com/front-range-harness — dual clip points, 4 adjustment points, foam padding, reflective trim, girth 13-43in — fetched excerpt
[ruffwear_front_range_collar] https://ruffwear.com/products/front-range-collar — neck sizing 11-26in across tiers — fetched excerpt
[ruffwear_front_range_leash] https://ruffwear.com/front-range-leash — 5ft length, swivel lockable clip, aluminum hardware, traffic handle — fetched excerpt
[cps_certified] https://centerforpetsafety.org/cps-certified/ — independent non-industry-funded crash-test certification program for pet travel harnesses — fetched excerpt
[cps_test_results] https://centerforpetsafety.org/test-results/ — published independent crash-test study library for harnesses — fetched excerpt
[cats_com_harness_guide] https://cats.com/best-cat-harness — cat harness buying advice centers on escape-proof design; step-in/vest are the main forms — fetched excerpt

Branches: species=cat -> ask breakaway_safety_mechanism, escape_resistance_design (sentence: "vets and animal welfare organizations continue to primarily recommend breakaway collars" + cats.com escape-proof framing); item_type=collar/harness/leash -> each routes to its own facet set (sentence: each type's "defining spec" differs per Wikipedia's separate dog_collar/dog_harness/leash articles); primary_goal=car_travel_safety -> ask car_crash_tested_certification (sentence: CPS Certified program page).

Noise (brand-sheet rows left out): shock/e-collar and bark collar values on dog_collar.txt's training-collar list -> left out, electronic training device belongs to training-behavior leaf, not plain restraint gear. Flea collar and Elizabethan/cone collar from dog_collar.txt's "Medical collars" section -> left out, medical-use product belongs to pet-medical-supplies leaf. Fashion/decorative collar (bow ties, jeweled) from dog_collar.txt's "Fashion collars" section -> left out, cosmetic only, fails the generic-category test. Stud/wolf/protection collar from dog_collar.txt's "Special-purpose" section -> left out, niche livestock-guardian gear, not on general retail listings. GPS tracking collar attachment -> left out, the tracker itself is an electronics product with no dedicated leaf found in catalog.json; not a collar/harness/leash spec.

Corrections (2026-10-26):
- Fixed `size_tier.why_experts_care` chest-girth figure 13-43in -> 13-42in; re-fetched ruffwear_front_range_harness and confirmed "13-17 in / 17-22 in / 22-27 in / 27-32 in / 32-42 in" as plain static text in the page HTML (not SVG-only as the check claimed), max tier tops out at 42, not 43.
- Made `item_type=harness`'s branch stop unconditionally asking `car_crash_tested_certification` and `escape_resistance_design`; those now fire only via the `primary_goal` split (car_travel_safety / escape_prevention), removing the double-ask.
- Added vocabulary entries for harness_style's `no_pull_tightening`, `sled_or_working`, `service_or_assistance`, and leash_type's `multi_dog_coupler`.
- Added new facet `id_tag_management` (values: dedicated_attachment_point, tag_silencer, id_pocket, none), wired into `item_type=collar`/`harness`/`matching_set` branches and excluded via `item_type=leash`'s makes_irrelevant; evidence is ruffwear_front_range_collar ("separate ID tag attachment point, a silicone tag silencer") and ruffwear_front_range_harness ("ID pocket keeps dog tags quiet"), both confirmed in re-fetched page text.
- Deepened `item_type=matching_set`'s then_ask to the union of the collar/harness/leash branches (added material, size_tier, breakaway_safety_mechanism, padding_lining, id_tag_management, leash_length, handle_type, clip_hardware_type).
- Reworded the "15 to 25 ft" retractable-leash figure (leash_type.why_experts_care, the retractable-leash tradeoff, and the wikipedia_leash reference's supports line) to "15 ft or 25 ft", matching wikipedia_leash's actual "15 or 25 feet" (two common fixed lengths, not a continuous range).