[54] Dogs might have a violet gland (or supracaudal gland) characterised by sebaceous glands over the dorsal floor in their tails; in a few breeds, it might be vestigial or absent. The enlargement in the violet gland from the tail, which often can create a bald spot from hair loss, https://martinkoskt.snack-blog.com/35702591/considerations-to-know-about-dog-digestive-health