After a pretty rough patch we have finally got some better news. The first week on the second course of antibiotics had no effect on the very swollen lymph glands so we took her back to the vets. He said it wasn't looking good and in all likelihood the problem was Lymphoma rather than Discosponylitis. He wanted her to go in for a biopsy and Xray of the neck and then to start her on chemo.
We spent the weekend frantically searching the net for info on both diseases but in the meantime Aila obviously didn't like the sound of a biopsy so promptly started recovering

Three weeks on and she is still on the antibiotics but is now one seriously happy dog who is chasing around like a puppy again. Her downward slide started so gradually that we had just thought she was getting older and quieter but now we have our wonderful lively dog back and we couldn't be happier.