Light: Calatheas can handle fairly low light. Any direct light will burn them. They won't grow as quickly if they're not getting a decent amount of indirect light, ideally a few hours a day.
Water: Keep the potting mix fairly moist, but not soggy.
Humidity: Calathea will do much better if you keep the humidity high, but they'll be ok with medium to medium low levels as long as you're keeping them well watered!
Pet Friendly: Yes!