Thanks again everyone for replies.
Still on the IMT rollercoaster, More bloods last week to see how Sar is going. Huge shock, all whites OK, however now low in the red cells, amemia!!! Off to the Uni of Qld for a full stomach scan. Good news there, nothing showed up at all, all organs are clear, liver, kidneys, spleen, pancreas etc. So no underlying nasty tumour that they can see. So why the no red cell count??? Vet thinks perhaps the Imuran (which has a side effect sometimes of causing anemia) so Imuran dose cut drastically, and upped the dose of the Prednisone. See how she goes until next week and then check everything again. I am worried about bone cancer, vets think not, that will be the next test, a bone marrow biopsy. Am beginning to wonder if I am being cruel and just clutching at straws for my own selfish reasons. Should I keep pursuing this or just do a wait and see on the treatment. Maybe see another vet specialist - or soemone who has treated lots of other dogs with this condition. A vet at the Uni suggested this was one way to go. My own vet has been fabulous though but is finding this all very frustrating.
Sar is still not her old self, and is lying around a lot - but I guess with the drugs and now the anemia - that is to be expected. Will keep everyone posted. Keep sending the good vibes our way please. Sarahs Mum XX