My long haired guinea pig, Fifi, has a wet bum.
Does anyone have any idea why? She doesn't seem to be in pain when she's going to the toilet so I don't think it's cystitus but I've never had to deal with that before so I don't know. :{
If it is cystitus, what can I do to help her?

If it is cystitus, what can I do to help her?