More: Diego Is an energetic, athletic dog who loves to swim and be outside. However, he also suffers from a rare condition called megaesophagus. Dogs with this condition no longer have motility in their esophagus and cannot eat normal dog food. However, we consider ourselves lucky because his condition is managed by feeding him meatballs in a specially built dog highchair which enables the food to descend to his stomach through the help of gravity.