Anal Glands (Sacs) Veterinary & Aquatic Services Department, Drs. Foster & Smith, Inc. Location and function of anal glands As the dog or cat is viewed from behind, anal glands (also called anal sacs) are located on each side of and slightly below the anal opening, at the 4 o'clock and 8 o'clock positions. A tiny duct or tube leads under the skin to an opening directly beside the anus. All predators, whether they are canines or felines in the wild or skunks in your backyard, have anal glands. They just use them differently. Skunks discharge the secretion from these glands as a form of defense, while dogs use it primarily for territorial marking or as a form of communication. In dogs and cats, every time a stool is passed, it should put enough pressure on the anal glands that some of the secretion is deposited on the surface of the stool. Other dogs and cats are then able to tell who has been in the neighborhood, just by sniffing the stools they find. Additionally, dogs and cats recognize each other by smelling each other in the general area of the anus, since each animal's anal glands produce a unique scent. Reference: http://www.peteducation.com/article.cfm?cls=2&cat=1571&articleid=510 简单的说，就是拿来标记气味，犬猫都有这样的功能，可以用来区分地域性。 一般在大便时肌肉的收缩，会导致肛门腺的分泌物沾附在粪便上，来达到标记的功能。 在臭鼬的应用上就比较不同，主要拿来防御。 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 219.86.66.52