A saddle that is too wide will:

A saddle that is too wide can indeed sink toward the horse's withers. This occurs because when a saddle does not provide adequate fit, the weight distribution is not even, leading to an improper position on the horse's back. The wider areas of the saddle do not make contact with the back in a balanced way, causing it to settle down toward the withers instead of sitting correctly. This misalignment can create pressure points that may lead to discomfort for the horse during riding or working.

Understanding saddle fit is crucial for the well-being of the horse, as a poorly fitting saddle can lead to a range of issues, including pain and restricted movement. Therefore, ensuring that the saddle fits properly according to the horse's conformation is essential for optimal performance and comfort.