i have the school guinea pig over and it is living with my guinea pig (his friend died recently) they are getting along so great they actually get dissressed when one of them goes away. anyway back to the point. i looked in the cage today and there is blood in all the places they have peed. its also in the carrier case. ive checked for wounded but there are no signes. i think it might be from there pee but because they have been housesd together there is no way of telling id it is my guinea pig or schools'. we rang up a vet clinic out of hours and spoke to the vet. she says that if they seem themselves then leave them over night and go in tomorrow. she thinks it may be cystitis os a stone. ive put them on white material and they are with me now. I'm probably going to be up all night with them but I'm just wondering if there is anything else i can do. my piggies have never been this seriously ill before so I'm just a bit concerned x