Tip of the day
Make sure you equip your items to get their effects, most don't work from inventory alone.

Translations:Pets/5/en

From Walkscape Walkthrough

Pets gain experience towards hatching or leveling up when selected as the active pet/egg and completing an action in an activity that meets the requirements for the pet (Eggs do not have any requirements). Pets will gain 1 experience point per step spent on the activity, this includes any steps used from the step bank as well. For example completing an activity with a action taking 50 steps will award 50 pet experience. Double action, double rewards, and any XP attributes do not effect the amount of pet experience earned.