Income
Coins generated relative to comparable unlocks.
The ranking method uses income, payback time, acquisition risk, and usefulness after upgrades.
The official listing does not provide a complete pet roster or income table, so no pet ranking is currently published.
A ranked list will require current pet names and comparable income values from the same game version.
Rarity alone will not decide placement. Each pet will be compared using the same four criteria.
Coins generated relative to comparable unlocks.
How quickly the animal pays back the effort required.
Hatch availability or the danger of stealing it.
How long it stays useful across treadmill and base upgrades.