Neurological Problems

[buschgobbler]

I have a one and a half old Australian Sheppard cross. She was a rescue dog from the states. We have had her for approx. 6 months now. She was always very healthy. About 2 weeks ago she started to limp (her back leg). It was not a bad limp and we did not think too much about it. Two days after the limping started it got worse so we took her to the vet. They x-rayed the leg and found nothing wrong. They tried a couple more tests (i.e. reflex test) and suggested that we visit a neurologist.

We went to the neurologist two days later. The limp was a lot worse (to the point where she could not walk well at all). The dr. noticed that her front leg was having problems as well. They thought that this could be a number of things -- potentially lymphoma or an autoimmune disease. They also mentioned that it could be some sort of US born virus -- although they did not really know. They conducted a number of tests (blood, urine, spinal tap, etc.) and gave us two sets of pills (one for the virus and one for the cancer). She has been on these for 4 days and has not gotten any better (although she has not gotten worse). She is in no pain (just frustration because she cannot really walk).

Does anyone have any idea what the problem could be (just suggestions) so that I can look into them. Someone mentioned lymes disease and we are now testing for that. Any help or comments would be appreciated.