Belly

The underline of the trunk that encloses the abdominal organs.

What is it?

A healthy horse has an even underline; a tight, tucked belly after work is normal, but staying that way is not. A pot belly appears in older horses, pregnant mares or with weak abdominal muscles.

Where is it?
Trunk

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