Bile reflux in dogs is one of the important factors leading to gastric ulcers. Some studies have shown that the bile component lithocholic acid in dogs can cause colonic mucosal epithelial hyperplasia by activating the mucin M receptors and nuclear receptors on the surface of colonic mucosal epithelial cells. Therefore, bile reflux has different degrees of damage to the gastric mucosa, and it is necessary to use gastroscopy and animal B-ultrasound to check the bile situation. The damage of bile reflux to the gastric mucosa is mainly manifested as active inflammation, intestinal metaplasia, glandular atrophy and focal hyperplasia. Compared with chronic gastritis without bile reflux, bile reflux can aggravate the degree of mucosal pathological changes in the entire stomach. Therefore, postoperative bile reflux can damage the gastric mucosa and cause bile reflux gastritis. The yellowing degree of the gastric mucus pool can be easily and quickly observed by gastroscopy, and the condition of the gastric mucosa can also be checked by animal B-ultrasound.

If dogs need to undergo gastrectomy, the scope of gastrectomy: Too much gastrectomy may affect postoperative feeding and nutritional status; too little gastrectomy may not reduce gastric acid enough after surgery, which may lead to recurrence of ulcers. According to clinical experience, it is generally appropriate to resect 2/3-3/4. Size of anastomosis: If the anastomosis is too small, it may cause stenosis; if the anastomosis is too large, food may pass through too quickly, which may cause dumping syndrome. Generally, 3 cm, about two horizontal fingers, is appropriate, and the excess stomach end can be sutured closed. Relationship between anastomosis and transverse colon: The gastrojejunostomy is located in front of or behind the colon, according to the surgeon's habit. As long as the operation is correct, it will not cause complications. After the operation, animal B-ultrasound should be used regularly to observe the postoperative condition. When performing such operations, it is necessary to place the distal jejunal segment in front of the proximal jejunal segment to avoid the formation of postoperative internal hernia. It is necessary to use animal B-ultrasound to observe the postoperative condition frequently.