My german shepherd is too skinny and has Diarrhea all the time

Question
Hi. My german Shepherd is 1 year 4 months old, and he is too skinny. He has been having diarrhea for about couple and months, and cause of it he lost so much weight, now we weighs around 60 pounds. What he eats just comes out as diarrhea, almost undigested. He had a worm test, blood test to see if there are anything wrong with him, but none of the tests provided clues to his 'illness' that he has. He already tried yeast, which was meant to help digestion and, anti bio, and steriods to stop the diarrhea. I even gave him boiled rice and chicken for weeks, but none of them helped. What can I do from this point?  

Answer
I would try a second vet.  My Aster went through that years ago when she was still a working dog guide.  Fortunately we could take her partner at that time and her to the dog guide school clinic and let a couple of top vets examine her and find and cure the problem.  

Even once you stop the diarrhea, he may still insist on keeping himself a little on the bony side.  It is very important you fix the diarrhea.