Not good news. Mavis has a mass in her bladder (probably cancerous). They can't operate but have said that pain relief and anti inflammatory drugs will keep her comfortable. The vet said it may be slow growing and they will do regular scans. I asked if she was suffering in any way and they said no. I am to take her back if she continues to lose weight or shows any other symptoms. Poor Mavis, she doesn't deserve this.
I'm still trying to digest this news.
@Wiebke is there anything positive I can do to help Mavis. Would giving her Cystease do any harm?