
Could it have been Intussusception
http://www.acvs.org/AnimalOwners/HealthConditions/SmallAnimalTopics/Intussusception/index.cfm?dspPrintReady=YOverview
The term intussusception (pronounced in-tuh-sus-sep-shun) is used to describe a condition in which one segment of the intestine (the intussusceptum) telescopes or invaginates into the lumen of and adjacent segment of intestine (the intussuscipiens). Intussusceptions may occur at any location in the gastrointestinal tract from the stomach to the large intestine, however, most commonly the bowel segments involved are the jejunum (in the middle of the small intestine) or the ileocecocolic junction (where the small intestine joins the large intestine or colon. Generally the intussusceptum is a more proximal portion of bowel (i.e. closer to the mouth) which telescopes into a more distal (closer to the anus) segment. This pattern follows the normal direction of peristalsis. The reverse, however, is occasionally found.