Gastrointestinal foreign body obstruction is a frequently diagnosed ailment in small animal medicine and postoperative ileus can be a challenging sequela to manage. Nasogastric feeding tubes can be utilized after surgery for both quantification of gastric residual volumes to identify ileus as well as nutritional management in anorexic patients. This single-institution retrospective study assesses the association of gastric residual volumes measured via nasogastric feeding tubes with gastrointest