Animal Hospital Anomalies & Enemies Guide

The patients at Animal Hospital aren't always what they seem. Some are anomalies — monstrous entities that disguise themselves as normal animals. This guide covers every type of anomaly, how to identify them, and the strategies you need to survive encounters with both anomalies and hostile enemies.

Animal Hospital official game art

What Are Anomalies?

Anomalies are entities that resemble normal patients but exhibit monstrous traits. Unlike regular patients, anomalies have symptoms that can be detected through several methods:

In person — some anomalies show visible physical abnormalities.
Through security cameras — some traits are only visible on camera feeds.
Through photos — using the in-game camera to take pictures of patients.

A single patient can exhibit more than one anomaly at a time, making identification complex and dangerous.

Why Anomaly Identification Matters

Letting an anomaly pass untreated has severe consequences:

Death Rituals — anomalous patients can trigger deadly events.
Monster Emerging — anomalies can transform into hostile creatures.
Shapeshifter transformation — anomalies can turn into Skinwalkers (Shapeshifters) that hunt and eat both patients and players who get too close.

However, killing an anomaly with the wrong treatment won't penalize the player (it doesn't count as a hospital death) — though it can spawn an Event.

⚠️ Key Rule: Identifying and correctly handling anomalies is one of the most important survival skills in Animal Hospital. Misidentifying an anomaly as a normal patient can cascade into a team-wiping event.

Types of Anomalies

Anomalies are categorized by how they're detected:

1. Appearance Anomalies

These anomalies can be identified without any equipment — just by looking at the patient. They can also be seen through security cameras and photos, but direct visual identification is sufficient.

Unnatural Facial Appearance

There are four variants of anomalies with unnatural facial features. Common traits include:

The patient loses their real face.
They constantly stare at the player as they move.
All four variants have a low-pitched and distorted voice.

The four variants include:

Realistic Face — big eyes, black pupils, prominent eyebags, and a large drawn-on smile. The smile disappears after being tased.
Three Eyes — three slightly mismatched glowing red eyes replace the patient's normal eyes. Sometimes the patient's actual eyes remain visible underneath.
Big Eyes & Smile — crooked, distorted smile with sharp teeth and large mismatched eyes positioned noticeably high on the face.
Circular Eyes — small but wide circular eyes with black pupils, paired with realistic teeth.
Hollow Face — the anomaly appears with hollowed-out facial features.

💡 Tip: If a patient is staring at you and their face looks wrong, do not treat them as a normal patient. Check for other anomaly signs before administering any treatment.

2. Photo Anomalies

Some anomalies can only be identified by taking a photo of the patient using the in-game camera. These anomalies appear normal in person but reveal their monstrous traits when photographed.

Cursed Photos

Cursed photo anomalies show disturbing, altered imagery when captured on camera. If you suspect a patient is an anomaly but can't see anything wrong in person, take a photo to confirm.

3. Security Camera Anomalies

Some anomalies are only visible when viewed through the security camera system. These patients appear completely normal when you're in the room with them, but their anomalous traits are visible on the camera feed.

💡 Strategy: Make it a habit to check security cameras regularly. If you skip camera checks, you may miss security camera anomalies entirely until it's too late.

Anomaly Behavior & Consequences

The Coffee Need

Interestingly, anomalies have a mysterious need for coffee. Certain anomalies appear at the hospital window — known as Head Bangers — and can be given coffee. The reason for this need and the side effects of consuming coffee are unknown, but it's a documented anomaly behavior.

"I'm Hungry" Response

On some occasions, if an anomaly is healed (treated successfully), it will say "I'm Hungry" and then either:

Exit the hospital without attacking anyone, or
Attack another patient.

This makes treating anomalies a gamble — healing them doesn't always neutralize the threat.

Shapeshifter (Skinwalker) Transformation

If an appearance anomaly is left untreated and allowed to pass, it can transform into a Shapeshifter (also called a Skinwalker). Shapeshifters are hostile entities that:

Eat patients — reducing your patient count and potentially causing hospital deaths.
Attack players who get too close.
Are extremely dangerous in close quarters.

Enemies vs. Anomalies

It's important to distinguish between anomalies and enemies:

Anomalies are disguised as patients. They sit in beds and may need to be identified through observation, photos, or cameras. They can become hostile if mishandled.
Enemies are openly hostile entities that actively hunt players and patients throughout the hospital.

For detailed information on specific enemy types, consult the official wiki's Enemies page.

Treatment and Anomalies

Here's the critical interaction between treatments and anomalies:

Action	Result
Treat a normal patient correctly	Patient recovers, you earn money and potentially Sanity
Treat a normal patient incorrectly	Patient dies, you lose 1 of 3 lives (hospital death)
Treat an anomaly incorrectly (wrong treatment)	Anomaly dies — no life penalty, but may spawn an Event
Let an appearance anomaly pass untreated	Can trigger Death Rituals, Monster Emerging, or Shapeshifter transformation
Heal an anomaly correctly	Anomaly says "I'm Hungry" — may leave peacefully or attack another patient

⚠️ Strategic Note: Sometimes it's safer to intentionally give an anomaly the wrong treatment to eliminate it, rather than risk healing it and having it attack. This avoids the life penalty and the risk of a Shapeshifter transformation — but be prepared for a potential Event spawn.

The Tendril (Room 8 Special Anomaly)

A special anomaly called the Tendril can spawn in Room 8 (Surgery). When it appears:

Another surgery begins immediately with a death countdown.
The treatment is virtually identical to a normal surgery.
You do not need to prepare with IV Drops for the Tendril surgery.
You still have the standard 45-second timer.

The Tendril is one of the most dangerous anomalies because it forces an immediate, high-pressure surgery with no prep time.

Advanced Anomaly Detection Strategy

To maximize your anomaly detection rate, follow this protocol:

Visual check first — when a new patient arrives, look at their face. Are the eyes wrong? Is the smile unnatural? Are they staring at you?
Listen to the voice — if the voice is low-pitched and distorted, it's likely an appearance anomaly.
Check security cameras — switch to the camera feed for the patient's room to look for security camera anomalies.
Take a photo — if everything looks normal so far, take a photo with the in-game camera to check for cursed photo anomalies.
Only treat if confident — if any check reveals anomalous traits, decide whether to eliminate (wrong treatment) or heal (correct treatment) based on the situation.

Items for Dealing with Anomalies

Several items are useful for anomaly encounters:

Taser — can be used on anomalies. For example, tasing the Realistic Face anomaly causes its smile to disappear.
Camera — essential for identifying photo anomalies.
Security camera access — needed to spot security camera anomalies.
Coffee — can be given to Head Banger anomalies at the window.
Weapons (Gun, etc.) — for dealing with hostile enemies that anomalies may spawn or become.

💡 Tip: The Security class starts with combat-oriented items, making it ideal for players who take on the anomaly-hunting role.

Events Triggered by Anomalies

Mishandling anomalies can trigger Events — dangerous, randomized occurrences that threaten the entire team. Known anomaly-triggered events include:

Death Ritual — a deadly ritual event triggered by letting appearance anomalies pass.
Monster Emerging — anomalies can cause monsters to emerge and attack.
Various other events — consult the official wiki's Events page for the full list.

Survival Tips for Anomaly Encounters

Always check new patients — run through the full detection protocol (visual, voice, camera, photo) before treating.
Don't rush treatments — taking 10 extra seconds to verify an anomaly is better than losing a life or triggering an event.
Communicate with your team — if you spot an anomaly, tell your teammates immediately so nobody accidentally treats it wrong.
Consider intentional elimination — if an anomaly is too dangerous to heal (risk of "I'm Hungry" attack), giving the wrong treatment eliminates it without life penalty.
Watch for the Tendril in Room 8 — if it spawns, drop everything and handle the surgery immediately.
Use the Taser strategically — some anomalies have visual traits that change when tased, confirming their identity.
Don't let appearance anomalies wander — untreated appearance anomalies can become Shapeshifters, which are far more dangerous.

Frequently Asked Questions

How do I know if a patient is an anomaly? Check for: unnatural facial appearance, staring behavior, low-pitched/distorted voice, security camera anomalies (visible only on camera), and cursed photos (visible only when photographed). Run through all detection methods before treating.

What happens if I give an anomaly the wrong treatment? The anomaly dies, but you don't lose a life (it's not counted as a hospital death). However, it may spawn a random Event, which could be dangerous.

What happens if I heal an anomaly correctly? The anomaly may say "I'm Hungry" and either leave peacefully or attack another patient. Healing anomalies is a gamble.

What is a Shapeshifter/Skinwalker? A hostile entity that an appearance anomaly can transform into if left untreated. Shapeshifters eat patients and attack players who get too close.

What is the Tendril? A special anomaly that spawns in Room 8 (Surgery). When it appears, an immediate surgery begins with a death countdown, but no IV Drops preparation is needed.

Where can I find more information about specific anomalies? The official Animal Hospital wiki has the most comprehensive, up-to-date information on every anomaly type, including visual references and detailed descriptions.

Related Guides

Animal Hospital Codes & Official Resources — latest codes and official links
Animal Hospital Beginner's Survival Guide — core mechanics and tips
Animal Hospital Classes Guide — all 10 classes explained

Anomaly information is sourced from the official Animal Hospital wiki and is current as of July 2026.