The anal glands or anal sacs are small glands near the anus in many mammals , including dogs  and cats. They are paired sacs on either side of the anus between the external and internal sphincter muscles. Sebaceous glands within the lining secrete a liquid that is used for identification of members within a species. These sacs are found in many carnivorans , including wolves ,  bears ,   sea otters  and kinkajous. The anal glands are in the wall of the anal canal.
Anal gland - Wikipedia
We respect your email privacy. The canine anal glands are located on each side of the anus where feces exits the body. When feces is released by the body, it creates a pressure on ducts that lead from the anal sacs. This pressure causes the sacs to empty.
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This post may contain affiliate links. Read more here. Unfortunately lots of dogs have problems with their anal glands.
It is believed that this smelly substance helps a dog mark their territory. If an anal gland becomes blocked, an infection or abscess may develop. This can be extremely painful and needs treatment by a vet. They should empty themselves when your dog goes to the toilet. Anal gland infections are nearly always a result of leaving blocked anal glands without treatment.