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| ===Carnivore=== | | ===Carnivore=== |
| + | *The dog and cat posses two '''anal sacs'''. In the dog, these are the size of a hazlenut. |
| + | **They are located ventrolaterally between the internal and external anal sphincters. |
| + | **The fundus of the sac secretes a potent smelling fluid that drains through a single duct to an opening near the anocutaneous juncntion. |
| + | **The anal sacs get compressed during defecation, which causes the fluid to be expressed. The scent of the fluid is thought to act as a territorial marker. |
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| ===Ruminant=== | | ===Ruminant=== |