Not an topic for a weak stomach or those squeamish about funky smells. I thought I would address this topic because all dog owners will have to deal with this at one point or another.
The anal glands or anal sacs are small glands found near the anus in many mammals, including dogs and cats. They are paired sacs located on either side of the anus between the external and internal sphincter muscles. Dogs anal sacs produce a fluid that is expelled in small amounts every time the dog defecates. This fluid is like a small USB flash drive that holds all the dogs personal information. Dogs like to share this information with other animals for different reasons. This is also why you will notice when dogs meet they will smell each others rears. They are just downloading info off their flash drive. This is part of how the animal kingdom communicates. Im so glad humans have words.
Most dog owners never think about these glands until something funky happens. Some signs are, the dog will scoot across the floor on his or her bottom. The owner may notice a HORRID smell coming from the rear end of their dog when it startles. The anal gland can abscess, it will actually make its own exit and you will notice the dog is in pain and has a bloody mess on their rear end. This will call for a vet visit
Your groomer should be expressing their glands every time they are groomed. Some dogs never have an issue and the whole process is done naturally without human intervention. But some dogs will exhibit the scooting thing. This is a sign your pet needs assistance in this area. You can do it yourself. Its pretty easy. Many pet owners don’t like it because it is one of the nastiest parts of owning a dog. I do it about once a month just to keep everyone in check. In 15 years of breeding I have only had on Shih Tzu that had an issue with this. That particular dog has not had an issue since. An ounce of prevention is worth a pound of cure. This is so simple to do at home, why waste time and money at the vet. The video below is a bit raw but is a good example of how the process works.