Ordinarily, hemorrhoids are
contained inside the anus, but when swollen, they can enlarge and descend, which is why hemorrhoids are so painful.
If you think of your cat's anus as a clock (stay with me here), the anal glands are located just
inside the anus at the 4 and 8 o'clock positions.
The anal sac is connected to a small duct where the anal sac fluid is emptied just
inside the anus.
Each sac is connected to the outside by a small tube (called a duct) that opens just
inside the anus.
Dogs and cats have two small anal glands just
inside their anus that express a strong smelling secretion.
Skunks have a pair of specialized sacs located in their anus; each sac is connected to the outside by a small duct that opens just
inside the anus.
They empty through short and narrow ducts just
inside the anus.