Core skill guide

How to Spot Anomalies in Animal Hospital

Anomaly detection is the gatekeeping skill that separates players who reach Shift 10 from players who die on Shift 3. It isn't reflexes — it's memory and a fixed scan order. Here's the full system.

Want the interactive version? The Anomaly Identifier turns this guide into a checklist that gives you an instant verdict.

The five-point check

Run the same five layers, in the same order, on every arrival. Each layer exposes a different category of anomaly, so skipping one leaves a blind spot. Only open the Shutter when all five agree.

Look — visual inspection of the live animal.
Photograph — compare the check-in snapshot to the patient.
Switch cameras — review the CCTV feed.
Read — check the appointment paperwork on the clipboard.
Listen — the audio at the window.

As shifts climb past four, anomalies start failing only one layer at a time — which is exactly why the full sequence matters. A clean record on four checks means nothing if the fifth quietly screams imposter.

Window tells (naked eye)

Three eyes — three mismatched glowing red eyes. Always wrong.
Mismatched eyes + sharp teeth — crooked grin, sharp teeth, two wrong-sized glowing eyes.
Hollow face — dark empty sockets, usually twitching.
Unnatural face — drawn-on smile, or realistic human teeth; stares at you as you move.
Twitching / hunched posture — jerking arms, head or neck; an elongated neck or hunch.
Distorted voice — a deep, low-pitched voice is a near-guaranteed tell.

Photo tells

Dr. Harlow's advice: anomalies hate having their photo taken. Never skip the camera, even when the patient looks fine.

Mismatch — the photo's eyes, ear shape, ear colour or horns differ from the live animal.
Static / grainy — a noisy snapshot. As of 6/22/26 static alone isn't a guaranteed anomaly, so confirm with another sign before rejecting.
Cursed photo — bloodshot eyes and a grin. Leave it on the counter; picking it up while it processes costs 10 Sanity.
Won't render — an unprocessed photo that never resolves.

CCTV tells

Some anomalies look normal at the window and only break on camera:

Black box / staring eyes over the face.
Stretched body that changes shape each time you reopen the feed.
Camera starer — looks dead into the lens, even while walking.
Void-black patient — completely black on camera.

Paperwork & audio tells

Missing appointment — looks normal but isn't on the booking list.
Wrong details — clipboard info doesn't match the animal.
Unsettling audio — growls, whispers or distorted speech.

Environmental enemies (Stalker & others)

Not every threat arrives at the check-in window. Environmental enemies — the Stalker, Bed Monster, Head Banger (Wall Banger), Hiders, Mass of Eyes, ceiling and wall lurkers, surgery tentacles and slime — spawn loose inside the hospital instead of queuing as patients, so the five-point check and the Shutter can't stop them. Each needs its own counterplay: don't look directly at the Stalker, calm the Bed Monster with Maple Syrup, keep your camera down for the ceiling lurker. Crucially, weapons only stop a Skinwalker — a Taser or Gun does nothing to the rest. See the threat danger tier list for how lethal each one is.

The Shutter rule

The safe error is always rejection. Wrongly rejecting a real patient costs a little time and score but never spawns a Skinwalker. Admitting an anomaly plants a hidden threat that may not reveal itself until it's killing someone. Don't reopen for "one more look" — hesitation admits the very imposter you flagged.

A single patient can carry more than one tell, so if something looks slightly off, check for a second sign before deciding — then reject without second-guessing. Practise with the Anomaly Identifier.

Up next: Treatment Guide — once you're admitting the right patients, treat them without losing one.

Verified June 2026 against community wikis, patch notes and gameplay. Tells change with updates — when in doubt, reject and confirm against the live game.

Frequently asked questions

What is the fastest way to spot an anomaly?

Use a fixed scan order on every patient — look, photograph, check CCTV, read the clipboard, then listen. A consistent order stops you forgetting a check under pressure.

What is the Stalker in Animal Hospital?

The Stalker is one of the game's environmental enemies — non-patient threats that spawn loose inside the hospital rather than arriving at check-in, so the Shutter can't stop them. Avoid it rather than fight it: don't look directly at the Stalker or it drains your Sanity, and weapons don't work on it (only on Skinwalkers).

Can a patient have more than one tell?

Yes. A single anomaly can carry several tells at once, so if something looks slightly off, check for a second sign — then reject without second-guessing.

Do I always need to take the photo?

Yes. Some anomalies look normal at the window and only break in the photo or on CCTV, so never skip the camera step.