What Does a 90% Pet Match Similarity Score Actually Mean?

A 90% pet similarity score means the visual "fingerprints" of two pet faces — numerical embeddings produced by a deep vision model — are 90% aligned, which in human terms means the two pets look strikingly alike: same coat pattern, same face shape, the kind of resemblance that makes people ask if they're related.

Here's how to read every band of the score, based on how matching behaves across PetMatch's pool of 7,500+ real pets.

What the number measures

The score is cosine similarity between two embeddings (the full pipeline explained), scaled to a percentage. It is a measure of visual similarity of the face region only — backgrounds and bodies are cropped out before scoring.

Reading the bands

• 95%+ — near-identical. Rare. Usually same breed, same coloring, same markings, similar age. Screenshot-and-send territory.
• 90–94% — true twins. The headline matches. Most pets in a pool this size have at least one match in this band as the pool grows.
• 80–89% — strong lookalikes. Same type and pattern family; a stranger would group them together instantly.
• 70–79% — same vibe. Clearly related looks, visibly different individuals.
• Below 70% — the pool doesn't hold your pet's twin *yet*. New pets join daily, and your matches re-rank as the pool grows.

Why you'll never see 100%

100% would mean mathematically identical embeddings — effectively the same photo. Even the same pet photographed twice scores below 100%, because lighting and angle shift the fingerprint slightly. Anything above 95% between two *different* animals is exceptional.

The trait breakdown

Alongside the overall score, PetMatch shows trait-level alignment — including dominant coat color comparison — so you can see *why* two pets matched: pattern-heavy agreement, structural similarity, or color harmony. Two matches with the same overall score can have very different breakdowns.

Can you raise your score?

You can't inflate it (the score is what it is), but you can avoid *understating* it. A sharp, front-facing, well-lit photo produces a precise fingerprint; a blurry angle produces a fuzzy one that suppresses all matches. If your top match seems low, re-upload with a better photo before concluding your pet is one of a kind.

See where your pet lands: upload a photo, or start with the pet twin guide.