Would appreciate any advice. Am taking care of my goddaughter's Basinji while she is in college. The dog has chronic diarrhea. Had it when we took her. Vet has done lots of blood work. Tried thyroid medication. Now they have her on a special diet. It's not working. She drinks lots and lots of water and is skin and bones. But she seems really healthy otherwise. We cannot afford a $2000 vet bill. Please, any suggestions?