I'd take him to the Vets asap. In July Baron started yelping when I picked him up behind his front legs. I thought he hurt his leg running around with the 2 other dogs. Turns out he has Pancreatitis....Totally shocked me. He had normal stools and was eating well @ the time he was diagnosed. Since that we've been through the wringer, But, I am happy to report that he is doing so much better now. He runs around and jumps over all the gates in the house just like he did before. Please let us know what your Vet says....