Barrel

The middle of the body, formed by the rib cage, between fore and hindquarters.

What is it?

The barrel houses the heart, lungs and much of the gut. A deep, well-sprung rib cage gives the lungs room and offers the saddle a stable base; the girth also passes here.

Where is it?
Trunk

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Sources: Merck Veterinary Manual · Wikipedia · The Open Sanctuary Project.