Pet Food is a minor currency in Idle Online Universe. It is used only to level up Pets.
The main source of Pet Food is by defeating an opponent in the Pet Arena, which rewards the player with Pet Points and Pet Food. Getting farther than the 'record high' (Highest opponent completed) will give the player a 10x reward.
Since Patch v0.98.50, 1 Pet Food is now worth 100 Pet XP. This is because the amount of Pet XP given is the number of Pet Food multiplied by 100. For example: 10 Fed Points for a snake is now 1000 Fed Points.
Other sources of Pet Food are:
- Chest Claims
- Expeditions
- Leveling up in Support Level
- Leveling up in Lineage Level
- Entering in Codes
Exchanging AP for Pet Food in the Shop.
- Buying one time Packs; this will bring other resources as well
- Participating in Events
- Exchanging at a rate of 1 Pet Food
for 5 AP 
- Unlocking a new tree via Woodcutting
There is one Trophy for collecting Pet Food.