I lost one of my intergrades to cancer, She had a similar swollen belly to that, didn't eat for 2 years. I could see she was wasting away, till one day when I picked her up I realised how frail she really was. She was skin and bone. I had her put down.
This was short lived excitement when she ate for the first time in two years, only to find them regurged, in her enclosure.