Causes
Common in puppies following a bout of gastroenteritis or a parasitic infection that increases intestinal movement. Also caused by foreign bodies or tumours.
Diagnosis
Abdominal ultrasound, which shows the characteristic target-shaped (bullseye) appearance.
Treatment
Emergency SURGERY to reposition or remove the affected section. The sooner it is done, the less intestinal damage occurs.
Prevention
Keep deworming up to date, and treat gastroenteritis promptly, especially in puppies.

