Taenia taeniaeformis, a common tapeworm of cats found worldwide, is transmitted via ingestion of the intermediate rodent host.The prepatent period of this tapeworm ranges from 32 to 80 days, and adults can live up to 3 years in the feline small intestine,measuring up to 60 cm long. The cat featured in this article was a barn cat with regular access to rodent prey.The cat presented for acute vomiting, anorexia, lethargy, and dyspnea.After blood analysis and radiography, the cat underwent surgery that explored the abdomen for a possible gastrointestinal obstruction. The intestines appeared plicated, and a moderate amount of serous abdominal effusion was present. Four enterotomies were created along the antimesenteric border of the duodenum, jejunum, and ileum to remove a“linear foreign body” later identified as approximately 30 adult T taeniaeformis cestodes.The cestodes weighed 6 g (or 0.1% the cat’s body weight). Abdominal fluid was examined cytologically for evidence of sepsis, but no bacteria or polymorphonucleocytes were found.No adhesions, strangulation, torsion, or intussusceptions were visualized, and the surgical opening was closed routinely.The patient was eating and was released 48 hours later; it was subsequently dewormed 10 days after surgery with a broad-spectrum anthelmintic.