Small: 4 inch standard nursery pot.
Light
Medium to bright light to maintain their vibrant foliage colors. Direct sun rays should be avoided, as they can burn the leaves.
Water
These semi-succulent leaves do not want to be overwatered. One of the first signs that you could be watering this plant too much is the leaves becoming squishy to touch. If you notice this on your plant then cut your watering schedule right back before you do too much damage to your plant.
Instead, allow the soil to dry out partially between waterings. Feel the top two inches of soil and as it begins to feel dry to touch give this plant a drink.
Plant Specific Care
Your plant will do well in medium-level humidity. It should be fine with the humidity level in most homes however if you live somewhere particularly dry you may want to consider adding some form of humidity to your plant care like a pebble tray filled with water, or you could try misting your plant once every few days. Things like heating systems can cause the air to dry out unnaturally so make sure you keep your Peperomia away from these.
Pet-Friendly Plant
Yes.