in.
the cage also has to fit the food dish, water bottle or dish, and litter box (if you choose to litter box train your rabbit).
that’s why i got the folding pen. it gives enough room that the rabbits need while keeping them in a confined area if i wanted to.
i used the pen for training purposes also. when my house rabbits were young and i had to leave, i would close the pen so they would remain safe while i was away.
when i returned i would open the pen so they could follow me around the apartment.
i also learned that house rabbits need a “nesting box”. this is a box 