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They are paired sacs on either side of the anus between the canine anal gland problem and internal sphincter muscles. The cryptoglandular theory states that obstruction of these ducts, presumably by accumulation of foreign material e. The canine anal gland problem is usually non-painful and swollen. J Am Vet Med Assoc. This page was last edited on 20 Decemberat This technique is known as anal sac expression. Behavior, Ecology, and Conservation. As with dogs, a cat's anal glands can spontaneously empty, especially under times of stress, and create a very sudden unpleasant change in the odor of the cat. They secrete into the anal canal via anal ducts which open into the anal crypts along the level of the dentate line.