Deep body conformation as a risk factor for large colon displacements in horses: Morphometric hypothesis

Summary Large colon volvulus (LCV), left dorsal displacement (LDDLC) and right dorsal displacement of the large colon (RDDLC) are among the most clinically important large colon disorders in horses, yet their pathophysiology remains incompletely understood. Existing explanatory frameworks emphasise gas accumulation, altered motility and management changes, but do not adequately account for the consistent overrepresentation of tall, large‐framed horses and the comparative rarity of these conditions in ponies. The objective of this article is to present a morphometric hypothesis in which deep‐trunk conformation defined as a relatively tall, narrow trunk with a large vertical distance from withers to sternum and a correspondingly elongated abdominal cavity provides the structural predisposition for large colon displacement. We propose that in deep‐bodied horses the dorsal and ventral colons hold a more vertical position within the abdomen and that gravity acting on a long, heavy, partially mobile colon generates traction on its mesenteric attachments that can initiate displacement depending on anatomical modifiers. In broodmares, the gravid uterus further accentuates the deep‐bodied profile in late gestation, amplifying risk of LCV while potentially providing a transient physical barrier against LDDLC. The hypothesis is supported by epidemiological data, comparative evidence from canine gastric dilatation‐volvulus and the low incidence of colon displacement in round‐bodied ponies. If confirmed by prospective morphometric studies, this model would justify incorporating body shape into risk stratification and into decision‐making for preventative surgical intervention to prevent large colon displacement.