Methodology & sources

Structural trait data

Size, weight range, height range, lifespan range, coat type, and breed-group classification are compiled from official breed standards published by national kennel and cat-fancy organizations — primarily AKC (American Kennel Club) breed-standard documents for dogs and CFA (Cat Fanciers' Association) / TICA breed-standard documents for cats. These are the authoritative published specifications for each recognized breed, not editorial estimates.

Rating-scale fields that breed standards don't directly quantify — energy level, grooming needs, shedding level, trainability, compatibility with kids, compatibility with other pets, and vocalization — are set on a consistent 1-5 scale cross-checked against veterinary and animal-behavior literature and established breed-characteristic references used across the pet-care industry. These are necessarily more interpretive than a published weight range, which is why we present them as a rating scale (with a visible dot indicator) rather than false-precision numbers, and why we welcome corrections — see contact.

Health predispositions

Common, breed-associated health issues listed on each profile describe elevated statistical predisposition within a breed population — drawn from veterinary literature on breed-associated conditions — not a diagnosis or prediction for any individual animal. This information is educational only, never veterinary advice. Always consult a licensed veterinarian for a specific pet's health, diet, or behavior needs; see our full terms for the complete disclaimer.

Cost estimates

Each breed's monthly/annual cost range (shown on its profile page and used by the cost estimator tool) reflects that breed's typical ongoing spend given its size, coat maintenance, and known health-predisposition load, cross-checked against published pet cost-of-ownership research. Where the estimator breaks a total down by category (food, routine vet care, supplies/grooming, and an insurance/emergency reserve) or adds a first-year setup range, those category splits are explicitly general, size-scaled industry-typical estimates — not breed-specific figures — because we don't have a reliably sourced per-breed split of exactly how a given breed's owners allocate spending. We'd rather be transparent about that boundary than present an invented breed-specific split as fact.

We also deliberately exclude costs that vary too widely by region and individual circumstance to publish a meaningful range at all — emergency or specialty veterinary care, spay/neuter surgery, professional training, and boarding or pet-sitting. Rather than publish a misleading national "average" for these, we flag them as separate line items to budget for locally.

Comparisons and written prose

Every breed overview, temperament narrative, "living with" section, comparison verdict, and FAQ answer on this site is originally authored — never copied from a breeder, publisher, or competitor site, and never assembled from a fixed sentence template. Where a comparison page states a "key difference," that figure is computed directly from the two breeds' real trait values (e.g. a 2-point gap in shedding rating), not asserted without basis.

Breed photography

Every breed photo on this site is a real, rights-cleared image sourced from Wikimedia Commons (via the corresponding Wikipedia article's lead image), used only under CC0, Public Domain, CC BY, or CC BY-SA licenses and self-hosted rather than hotlinked. Breeds for which we couldn't find an acceptable freely-licensed photo show an illustrative motif instead of an unlicensed image. Full per-image author, license, and source attribution is on our image credits page.

Classification (groups)

AKC breed-group and CFA body-type classifications used to organize our directory and group-hub pages are real, published classifications — not editorial invention. Where a breed straddles categories (e.g. a Foundation Stock Service breed not yet in a full AKC group), we note that explicitly rather than force-fitting it.

Why some breeds show "pending" trait data

Our directory includes every recognized breed within the AKC/FCI/UKC classification for dogs and the CFA/TICA classification for cats — a deliberately complete roster rather than a curated "top breeds only" list. Sourcing a full, defensible trait table for every one of those breeds is genuinely more work than most breed sites attempt, and it's ongoing: rarer breeds with thinner published documentation are explicitly flagged as pending rather than filled in with an invented number just to complete the table. If a breed profile shows a "pending" note instead of a full trait table, that's an honest statement about our current sourcing, not an error — check back, or ask us to prioritize it via contact.

Tool calculations

The breed selector quiz and compare tool run entirely in your browser against the same structured trait dataset used everywhere else on the site — no separate server-side scoring model, no hidden weighting you can't see reflected in the displayed reasons. The paid Breed Match Report adds a human review step on top of a longer questionnaire, specifically because some household-composition and budget factors are better judged with human reasoning than a fixed scoring formula.

Corrections

Breed standards and veterinary consensus do shift over time, and structured data at this scale (hundreds of breeds, thousands of derived comparisons) can contain errors. If you spot one — a weight range, a health predisposition, a cost figure that looks off — tell us specifically which page and what the issue is via our contact page; corrections are the single most valuable message you can send us.