Ugh, Pet Co won't tell us, at least the person I talked to on the phone wouldn't. He said to take him to the vet for a digestion issue. We called the vet, and the vet said to just try a different kind of food since the little guy is eating, just not the pellets. We have chew toys for him too. The guy at Pet Co we talked to when we bought him made sure we had everything. I couldn't believe how expensive it all was.