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Animal Hospital Shifts & Slime Shift Guide

Verified progression milestones, the first Slime Shift window, and what to do when Slimebert enters the hospital.

Quick answer: Animal Hospital does not switch to a separate endless mode at Shift 7. Progress continues through later encounters and Journal milestones; the first Slime Shift can occur between Shifts 12 and 23.
Progression correction:

Earlier versions of this guide treated Shift 7 as a fixed mode boundary. Current gameplay evidence shows continued story, Slime Shift, and Journal progression well beyond that point, so the guide now lists only reproducible milestones.

Special Shift Timing

EventTimingBest preparation
AmbulanceFirst at Shift 4; six patients; later every 5 shiftsSplit critical care, admission, and treatment roles
Rainy Shift — standardUsually around Shift 6Keep the lobby and treatment route clear while checking unusual patients
Rainy Shift — Skip TutorialUsually around Shift 3Prepare emergency tools earlier because the tutorial buffer is shorter
Slime ShiftCurrent table uses Shift 12–23; exact timing can varyContinue the normal loop and route around Slimebert

Verified Shift Milestones

Shift 1

Treatment Tutorial

Two scripted normal patients teach check-in and treatment. The first uses Herbs for a stomach ache; the second uses Eye Drops for dried eyes.

Player task: Learn the treatment route. The shutters and cameras become available for later shifts.

Shift 2

Anomalies and Events Begin

Regular patients, anomalies, story characters, and enemies can now appear. The Emergency Wing and Supplies Shop unlock after the shift.

Player task: Start checking appearance, photos, and cameras before admitting patients.

Shift 3

Inspection Reminder

The core loop continues while Dr. Harlow reinforces camera and photo checks. The Taser unlock follows this stage.

Player task: Stop treating the window check as visual-only; use every available information source.

Shift 4

Anomaly Attack and Ambulance

Dr. Harlow reacts to an anomaly attack, a News Bunny broadcast appears, and the scripted Ambulance sequence sends six possible patients into the hospital.

Player task: Split admissions and treatment work so the sudden patient load does not collapse the run.

Shift 6

Sanity and Death Limit

Dr. Harlow gives his last automatic shift briefing and warns that three animal deaths will fail the run.

Player task: Prioritize patient survival and sanity before optional interactions.

Shift 10+

Journal and Story Milestones

Shift 10 is the first late-run Journal reward. Liz can begin appearing around the Shift 11-12 stage with her UV Camera quest.

Player task: Check the Journal in the lobby and prepare for encounter-specific objectives.

Shift 12-23

First Slime Shift Window

The first Slime Shift can occur in this range. Slime spreads, Hazmat workers arrive, and Slimebert roams the hospital.

Player task: Route around Slimebert, use the Fire Extinguisher only for a temporary stun, and finish the shift.

Shift 25/50/100

Long-Run Journal Goals

The Journal awards 50, 100, and 250 Animal Coins for reaching Shifts 25, 50, and 100.

Player task: Use a coordinated team and treat these as long-run milestones, not new mode boundaries.

How the Slime Shift Works

StageWhat happensBest response
Start windowFirst event occurs between Shifts 12 and 23Keep the run going; do not expect exactly Shift 12
EnvironmentSlime appears on floors, walls, ceilings, and item casesWatch movement routes and keep key work areas accessible
Hazmat teamWorkers enter and clean slime until the shift endsLet them work while your team continues hospital tasks
SlimebertRoams the hospital and can eat players or patientsKeep distance; use the Fire Extinguisher only to create space
CompletionSlimebert and remaining slime disappear at shift endFinish the shift instead of trying to defeat him
AfterwardSam can arrive at check-in and costs $250Hire him for three shifts of cleanup support if needed

How to Complete the Slime Shift

Keep admissions moving

The event does not replace the normal hospital loop. Continue checking and treating patients while the Hazmat workers handle slime.

Protect Slimebert routes

Slimebert can eat patients and make them faint. Move around him and avoid leaving vulnerable patients in his path.

Use the extinguisher to escape

A Fire Extinguisher briefly stuns Slimebert. Use that opening to leave; it does not remove him from the shift.

Wait for normal completion

When the shift ends, Slimebert, the Hazmat workers, and remaining slime leave. Sam may then appear at check-in.

Shift FAQ

How many shifts are in Animal Hospital?

There is no fixed final shift currently documented. Runs can continue beyond the tutorial and story milestones, with Journal rewards at Shifts 10, 25, 50, and 100.

When does the first Slime Shift happen?

The Slime Shift window is not a single universal trigger in every run. The current progression table uses the Shift 12–23 window; mode and version differences can move the first event, so follow the live shift state instead of forcing Shift 12.

What happens during a Slime Shift?

Green slime spreads across the hospital, Hazmat workers arrive to clean it, and Slimebert enters and roams the halls. Complete the normal shift while avoiding him; remaining slime and Slimebert disappear when the shift ends.

When does Sam appear?

Sam appears after the first Slime Shift. You can hire him for $250, and he helps with slime, Hiders, and room fires for three shifts.

Is Shift 7 the start of endless mode?

No fixed Shift 7 transition is supported by the current progression evidence. The game continues through later story, event, Slime Shift, and Journal milestones.

Can a Slime Shift end without defeating Slimebert?

Yes. You are not expected to kill him. Keep the hospital running until the shift completes, and he will leave automatically.

When does the Ambulance Event begin?

The first Ambulance Event is the Shift 4 sequence. It brings six patients, can include a critical patient timer, and later repeats every five shifts.

When can Rainy Shift appear?

The standard flow usually reaches Rainy Shift around Shift 6, while Skip Tutorial runs can reach it around Shift 3. Treat the mode as a run-state event rather than a guaranteed single shift.

Next Tasks