Quick facts
Small black rat โ white muzzle, buck teeth, curled pink tail
Around Shifts 2โ4, then roughly five visits across your run
No โ explicitly not an anomaly, despite the camera staring
A key to the Room 5 safe, and a note
The little black rat who stares at your cameras is not an anomaly โ he's the game's most important informant, and the questline he leaves behind unlocks the deepest piece of lore in Animal Hospital (Anomaly).
Small black rat โ white muzzle, buck teeth, curled pink tail
Around Shifts 2โ4, then roughly five visits across your run
No โ explicitly not an anomaly, despite the camera staring
A key to the Room 5 safe, and a note
Room 5 is at the far back-right of the hallway. Remove the cat posteron the wall and a hidden safe appears โ Ratthew's key opens it. Inside:
The community widely reads that note as the origin story of the Stalker โ and the suitcase matches the ones Dr. Harlow and Ron from Accounting carry, tying all three storylines to the same Animal Corp experiment.
While Ratthew is in the office, he warns you in red text whenever an anomaly approaches check-in โ a free second opinion during some of the game's trickiest shifts. Let him stay.
Storyline verified against community data. Last checked: July 11, 2026.