Here is the answer…
Here is the annotated video clip of the 13 year old miniature poodle.
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The pedunculated lesions (at least 2) were located in the antrum of the stomach. The dog was rotated to the right, in order to move the existing fluid in the stomach toward the pyloro-duodenal junction. As you can see during peristaltic activity, the nodules “float” and move back and forth…possibly mimicking an intussusception. The lesions are moderately echogenic and partially layered, and seem bordered by a hyperechoic wavy mucosal line. When asked after the ultrasound findings, the owner mentioned a recent episode of vomiting of undigested food.
Endoscopic biopsies were taken and the diagnosis was gastric inflammatory polyps with concurrent marked diffuse mucosal hyperplasia and moderate chronic neutrophilic and lymphohistiocytic gastritis (myriad of bacteria).
These lesions can be quite spectacular but not uncommon in miniature breeds. In absence of clinical signs, follow-up ultrasound may be recommended.