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"Dogs, like other carnivores, have a pair of small sacs on either side of their anus (commonly called the &amp;ldquo;butt hole&amp;rdquo;), which is the end of the digestive tract. These anal glands produce a smelly, yellowish-gray to brownish pasty material, which normally is expelled when a dog poops or when it is startled or frightened. This is often attributed to territorial marking. The actual cause of anal sac problems is not well-understood. Anal sac &amp;ldquo;disease&amp;rdquo; happens when the sacs become inflamed, impacted, infected, irritated, abscessed or affected by tumors. Dogs with anal sac problems can&amp;rsquo;t properly eliminate the fragrant material that their glands normally produce. This causes lots of itchiness, pain and general discomfort. Unfortunately, anal sac problems are fairly common in domestic dogs. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Anal-Sac-Disease.aspx>