Acute gastrointestinal (gut) injury (AGI) occurs in people and in dogs with critical illness. In people, AGI as a complication of serious illness occurs in 60% of intensive care patients and is associated with an increased risk of death. The rate that AGI occurs in dogs is unknown, although evidence suggests that dogs do show signs of this complication, which can result in failure to deliver nutrition by mouth and potentially fatal complications. With this study, investigators aim to better define AGI in dogs, and to determine the occurrence of some complications that occur with AGI, including gastrointestinal ulcers and changes in intestinal motility. To do this, investigators will use video capsule endoscopy, a vitamin-sized capsule with tiny cameras, which is given to the dog orally to see inside the dog’s gastrointestinal tract. Investigators hope that this work will eventually allow for improved care and survival in critically ill dogs.