In an attempt to make Stewie and Stella indoor pigs we bring them in periodically when we can supervise them. Being juvenile pigs, they really like to get into things. This means that we have to keep a close eye on them at all times. Just like raising a child, successfully raising a pig take a lot of hard work and attention.
On the other hand Mason is just as happy sleeping the day away in his tent between meals.
Penelope and Petunia sleep the day away with Rosco and Snickers completely buried.