The Dermoid Sinus runs along the neck, back and tail of dogs in the Ridgeback family. It is a neural tube that is meant to drain dead cells, tissue, etc. However, during the embryonic state it can develop incorrectly causing infection or even abscesses along and under the skin. Signs that your Ridgeback breed canine may have the Dermoid Sinus defect include an opening on the middle of the back with protruding hair or a swirl and a tube or cord that can be felt beneath the opening. Some of the defects may not be visible as they are further beneath the skin, however, a discharge may be visible. Infections can occur when the sinus becomes plugged and unable to drain as intended. Some of these sinuses connect to the lining of the spinal cord causing alarm for neurological damage as well. For more information, consult with your veterinarian Washington, DC.