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The condition in which two or more spinous processes touch or rub against each other is known as Kissing Spine. This condition is often observed in horses and can lead to pain and discomfort, as the overlapping of the spinous processes can cause inflammation and irritation in the surrounding tissues. Symptoms may include changes in behavior, difficulty with certain movements, or signs of pain when riding or being handled.

In contrast, colic refers to abdominal pain and can have various causes unrelated to the spine. Rain rot is a skin condition caused by a bacterial infection, usually manifesting as patches of hair loss and scabs, while thrush, an infection of the hoof, primarily affects the foot and has no relation to spine alignment. Understanding these differences helps to clarify why Kissing Spine is the correct term for this spinal condition.