Acquired antral pyloric hypertrophy in the dog.

Acquired antral pyloric hypertrophy is one of the most common causes of pyloric obstruction in the small (10 kg) mature or old dog. Clinical signs include chronic intermittent vomiting after meals and occasional weight loss or abdominal distension. Definitive diagnosis is made by exploratory laparotomy and histologic examination of excised tissues. Most dogs with acquired antral pyloric hypertrophy become clinically normal after surgical correction of the gastric outlet obstruction.