My guinea pig, Vanilla, has a very sickly smell to her, akin to feces (her bottom is clean, so it is not actually feces). She has several heal problems, like blindness, deafness and neurological damage (she is a lethal pig). She is approximately four to five years old. She has seen a vet recently for an eye problem (she had occular discharge, causing baldness around the eyes). The vet conducted a very thorough check and said he had not seen a lethal pig live for this long before. He checked for cancer and said she did not appear to have any. She possibly has arthritis, but it is hard to tell because she walks funny due to the neurological issues. Well, tonight I noticed a very foul smell coming from her cage. I checked the cage and found no noticeable feces problem. I picked her up and noticed that the smell was emanating from her body. The first thing I thought of was that she possibly was dying. Has anyone else experienced their guinea pig emitting a foul odour before passing? Her vet office is closed, but the vet did say to keep her comfortable and bring her in tomorrow if she is still like this. She is also more lethargic than normal. Please advise, as I am so worried for her! Thank you in advance for your help.