bathroom

Hello! My little guinea pig Chili is about 5 years old now, & for the past three days we've noticed he seems to have a big bathroom issue. I was cleaning his cage, and I noticed there was literally no poop, and then all of a sudden there's just a giant ball of poop in the corner where he was...

So we got our house renovated and the Guinea pig room got knocked down (they had a special room so the cat & dog couldn't get at them) so we put them in the guest room which is not used 90% of the time. My sister came home from uni for Christmas and now my parents are insisting my piggies stay...