What is your diagnosis?
Little Bear is a 7 1/2 year old, male neutered, mixed breed dog. On November 8, 20**, he presented to Animal Kind Veterinary Hospital for decreased activity and dramatically decreased appetite of one week’s duration. His family also reported that he seemed to be drinking more water than usual, had an episode of vomiting three days prior, and was passing less stool than usual. There was no history of travel, dietary indiscretion, or known toxin exposure.