Hello - we have a 100 lb chocolate lab, who will be 6 yrs old in March. He has been 100% healthy for his entire life until 10 days ago, when he suddenly was lame. Things went downhill from there. He wouldn't eat and cried out in pain most of the time. After several visits to the Vets and many tests (lots of blood work, Xrays and biopsies) the Vets are at a loss as to what is wrong with him. They have ruled out cancer, lyme disease and other diseases. He seemed to be making progress yesterday and we were hopeful that there was light at the end of the tunnel. Last night I picked up antibiotic from the Vets for another week, but they discontinued the pain medication. Unfortunately, our dog is back to where he was 10 days ago now. He won't eat, is very lame, and cries out in pain every time he moves. We would be very appreciative of any thoughts or suggestions. Thank you very much.