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Hi, I can help you with your question today.
The condition you are thinking of is megaesophagus.
In these dogs, the esophagus is dilated and does not have normal motility. These dogs are much more prone to aspiration of their food, and hence we keep them upright to keep the food down (by gravity) to prevent them from regurgitating after eating.
This condition can be congenital or acquired later in life due to various conditions.
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