my bunny have morning playtime and evening playtime everyday. When i’m home my bunny is always out from the pen,but when i’m working/going out he’s inside the pen just to make sure he doesn’t run off and accidents happen. he lives on second floor with me so there are stairs, scared he might fall from stairs >.< 

He’s always pissed whenever I lock the playpen
, sometimes even when the playpen is open he is relaxing inside the cage but he doesn’t like it when I close in the pen he will start to dig and chew off the metal railings.
However, I recently spoke to its breeder (I owned this bunny for around 1.5 months now) he said that my playpen/cage is too big because previously in the breeder he only got 50cmx60cm cage. Whereas now his cage is 1.8meter x 1.8meter.
Does bigger pen induce more stress to bunny?
I heard from some people the smaller the bunny space is during travelling the less stress the bunny. Does this rule apply to house bunny?
I attached my bunny’s playpen picture for reference
