Cats have anal glands which produce fluid into sacs that are located on either side of the anus. This fluid is assumed to be a scent marker that is useful in delineating territory. Anal sac disorders involve impaction of anal sac fluid, inflammation of the sac(s), and abscess of the sac(s), which can lead to anal gland rupture. Impaction is the most commonly occurring type of anal gland disorder.
 
Symptoms and Types
 

Scooting along the floor
Straining to defecate
Scratching at the anus
Licking and biting around th ...read more