There may or may not be blockages. The problem with a regular x-ray is that it only tells us if there is a blockage that shows on x-rays. A stick, part of a toy, a dryer sheet, part of a rubber ball, condom, etc. these types of foreign bodies often don't show on x-rays and do require contrast. That said, most dogs feel horrible with a full blockage so a partial blockage may be a consideration. If this persists, he really needs to have more diagnostics performed. For some dogs, they also need to have x-rays from their mouth down to where their ribs meet. Some puppies will have congenital issues (or can acquire an esophageal foreign body) that cause food to become trapped in the esophagus causing irritation and vomiting at random times, without the puppy feeling poorly.
It may be worth separating feeding times into 4-6 feedings and to see if the vomiting persists, to change the consistency of the food from kibble to moist or from moist to pureed, etc. to see if this has any bearing on his vomiting as well. For 1-2 hours following a meal, puppies should be encouraged not to partake in heavy play, too, as this is a time of increased risk for upset stomach due to activity.
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