A one-month-old Belgian blue bull calf was referred to the animal hospital of the Faculty ofVeterinary Medicine (UGhent) because of the sudden onset of severe colic. The animal showedintermittent recumbency, kicking to the abdomen, abdominal distension of the right quadrants,absence of feces and fluid-splashing and the presence of ping sounds on auscultation of the rightside. Abdominal ultrasound showed distended, but still contractile small intestines with thickenedwalls. On exploratory laparotomy, a complete obstruction with adult Toxocara vitulorumextending from duodenum to mid-jejunum was diagnosed. On the punctum maximum of theobstruction, the ascarides were partially removed through an enterotomy. After vermifugationwith doramectin, ascarides were found in the animal’s feces in the next days. In contrast to ascarideinfections in puppies, piglets and foals, to the author’s knowledge, intestinal obstructioncaused by T. vitulorum has not been described previously in calves.