👉 The term "underfurrow" is a medical term used to describe an area of skin that is not covered by hair. It is often found on the neck, back, and shoulders in mammals, such as dogs, cats, and horses. Underfurrows are also known as "boneless" or "bone-free" areas, as they do not contain any underlying bone structures. They can be caused by various factors, including trauma, infection, or other conditions that damage the skin. In