poor piggies
as said it can cause them to fight, though my girls had a 4ft by 18 inches and the late choloe and then jessie picked on zoe, humping, rump wobbling etc it got to the stage where zoe is scared of other piggies.
i also agree it can cause the piggies to be sad and bored! do they go out into a run during the day or have play time or cuddle time?
i am also guessing it would affect their legs and muscle tone if they haven't enough room to move in. perhaps suggest she get another cage and join the two together. otherwise she could get reported to the rspca as it is cruel not to have a big enough cage for them. good luck with your friend, perhaps she will let you have the piggies. hugs xx>>>xx>>>xx>>> i was wondering how the vomit icon was going to used. good one gaile.