Call A Pet Pet Index: Completing a Zone and the Permanent Income Boost

The short answer: the Pet Index in Call A Pet — the game labels it "FILL THE INDEX" — is a per-zone collection log. A zone counts as complete when every pet belonging to that zone has been discovered, and the game's own rule attaches the reward straight to that moment: "Discover every pet in a zone to unlock a permanent income boost." No separate claim step is described — the boost is presented as unlocked the moment a zone's set is finished, and it is permanent, not a timed buff.

That one line is the whole official system, and it's enough to plan around: finish a zone's pets, gain a lasting income increase.

How the Pet Index works

The index fills as pets are discovered, and the unit that matters is the zone. Each zone has its own set of pets belonging to it, and completion is judged zone by zone — not by how many pets you own in total. A zone that is missing even one of its pets isn't complete, while a zone whose full set is discovered triggers its boost on its own.

What completing a zone takes

The stated bar is discovery: every pet in the zone, discovered, and nothing short of that. One caveat worth knowing before you plan around it: the game's description states the rule in a single line but doesn't spell out the screens around it — which exact action logs a pet as discovered, or how the index lists your remaining entries. So when you're closing out a zone, let the in-game index settle any question about which entries are still missing rather than assuming.

The reward: a permanent income boost

Completing a zone unlocks a permanent income boost. "Permanent" is the game's own word: this is a lasting increase to your income, not a temporary boost that runs out. Because the rule reads "to unlock," the boost is presented as granted upon meeting the completion condition itself — no claim step, turn-in or delivery is described anywhere in the game's summary of the system.

Two details are left open, and they're worth stating plainly so you can plan: the exact size of the boost isn't given, and it isn't stated whether boosts from several completed zones combine. What is promised — and all you need to pursue it — is the trigger (full discovery of a zone's pets) and the result (a permanent income increase).

Rare finds are a different bonus

The same description advertises the game's rarest content under "RARE FINDS": Golden and Rainbow pet variants obtained by hatching, each carrying "huge income bonuses," plus the legendary Secret pets to hunt — Cerberus, Anubis and Yeti. These play a different role from the index reward, and keeping the two apart matters:

The rare variants' bonuses ride on the pets you hatch; the zone boost is a separate, permanent reward for finishing a zone's index — they are not the same mechanic. The description also doesn't say whether Golden, Rainbow or Secret pets occupy index slots, so treat hunting the rarest pets and completing a zone as related but distinct goals rather than one task.

Where to go next

With the rule and the reward clear, the natural next stop is the Call A Pet zones guide for the zones whose indexes you're filling, or the egg hatching guide if you're still working on obtaining pets to round out a zone's set. The Call A Pet pets page is the broader reference for the game's pets.