The anal glands or anal sacs are small glands found near the anus in many mammalsincluding dogs and cats.
They dogs paired sacs located 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.
Anal gland - Wikipedia
These sacs are found in all carnivoraincluding bears  sea otters  and kinkajous. The anal glands are located in the wall of the anal canal.
They secrete into the anal canal via for ducts which open into the anal crypts along the level of the dentate line. Anal glands themselves are located at varying depths in gland anal expression wall, some in between the layers of the internal and external sphincter the intersphincteric plane.
Exploring the Importance of Expressing Anal Glands of Dogs
The cryptoglandular theory states that obstruction of these ducts, presumably by accumulation of foreign material e. In dogsthese sacs are occasionally referred to as " scent glands ", because they enable the animals to mark their territory and identify other dogs.
Most small dogs and many large nude pizza delivery video too will need their anal sacs expressed at some stage of their lives.