Your cat's anal sacs, roughly the size of peas, empty each time Fluffy defecates. If these sacs fail to empty, they may need to be manually extracted. If you lift Fluffy's tail, you'll notice two anal glands located slightly below the anus on each side. While small in size, each anal sac contains a large number of sebaceous sweat glands that produce a foul-smelling odor. When Fluffy defecates, the rectal pressure causes these anal sacs to naturally secrete a gray to brown liquid. Your cat uses this secretion to mark his territory and ward off enemies.
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How often should anal sacs be emptied and what are some of the misconceptions about the best antibiotics to use for infection? What are anal sacs and why do they fill up? Anal sacs, sometimes mistakenly referred to as anal glands, are two small structures located between the internal and external sphincter muscles. Each sac is lined with both sebaceous and apocrine glands whose combined secretions produce a semi-oil foul smelling brown liquid. As the anal sphincter muscles expand, as defaecation occurs, pressure on the sacs leads to the expulsion of their contents over the faeces.
Medically reviewed by Drugs. Last updated on Aug 31, The anus is that part of the intestinal tract that passes through the muscular canal of the pelvis and anal sphincters.