We are going through that with Blackie (age 13). She suddenly got sick two weeks ago. After many tests including x-rays and an ultrasound, she got the same diagnosis. Blackie is now on Ursodiol and prescription food (Royal Canin Gastrointestinal). She has improved a lot and gained back two of the four pounds she lost. I don't know of any natural supplements. Blackie's meds and foods are expensive but she is so much better. Our Braggs also had the same problem and was on Ursodiol, too. We lost Braggs to cancer.