Animal Hospital Anomaly Tier List
A site-maintained study order for the confirmed anomaly roster. Learn the S-tier threats first, then apply the full Visual, Photo, and CCTV check to every patient.
Instant threats — recognize these immediately or lose the shift.
Dangerous but learnable with practice.
Moderate threat — noticeable once you know the signs.
Lower priority — easy to spot with baseline knowledge.
Why these rankings?
This is a site-maintained study order, not an official in-game rank. The current roster contains 18 documented anomaly types. Crooked Face and Mimic sit at S-tier because their tells are costly to miss: Crooked Face can change expression while its mismatched eyes remain, and Mimic only reveals its form through CCTV after it reaches check-in. The remaining entries are grouped by how quickly their visual, photo, or camera evidence can be recognized during a normal run.
See exactly how to deal with each one on the anomaly list.
How to use the ranking well
A tier list should change what you practice next, not just tell you what looks scary. If an anomaly is high tier because it is easy to miss, your response should be to train the relevant detection layer. If it is high tier because the punishment is severe, your response should be to slow the final decision and keep that threat in mind whenever the right patient type appears.
This page is less useful as a standalone reference than the full anomaly list. Use it to choose study order, then open the linked anomaly for the actual signs and handling.
Summary Comparison
| Tier | Danger level | Practice priority | Recommended guide next |
|---|---|---|---|
| S tier | Highest | Memorize first | Anomaly List, Patient Roster |
| A tier | High | Study after S tier is automatic | Anomaly List |
| B tier | Moderate | Learn through repeated runs once core threats are stable | Beginner Guide |
| C tier | Lower | Use as cleanup knowledge after the major punishers are solved | Shifts, Classes |
Final recommendation
Use the tier list to decide what deserves your attention first, not to replace the real guide. Learn S tier until it feels automatic, move through A tier with deliberate practice, then let the lower tiers fill in naturally as your baseline recognition gets stronger.
Tier list FAQ
How is this tier list ranked?
This is an Animal Hospital Wiki study-priority ranking, not an official in-game tier list. It weighs the likely cost of a missed anomaly against how difficult its required visual, photo, or CCTV check is. S-tier entries are the best first study targets; C-tier entries are lower-priority once the core checks are automatic.
Will the tiers change with updates?
Yes. The official wiki currently documents 18 patient anomaly types, including Tiny Anomaly added in the July 25 Hazmat update. We re-evaluate this site ranking when official mechanics, tell signs, or the anomaly roster change.
Which anomalies should I memorize first?
Focus on S-tier and A-tier anomalies first. Memorize their tell signs, appearance, and the check that catches them. Once those are automatic, work through B-tier and then C-tier without skipping the normal Visual, Photo, and CCTV routine.
Why is Mimic high-tier?
Mimic can appear normal at the window and in the photo, then only reveal its form through security cameras after reaching the check-in spot. That camera-only timing makes it a high-priority entry for players who tend to rush the CCTV check.
Is this tier list for solo or multiplayer?
The rankings emphasize solo study order, where one player must complete every check. In multiplayer, a dedicated CCTV player can reduce the practical difficulty of camera-only forms, but teams should still follow the same Visual, Photo, and CCTV routine.