An anal abscess is a painful condition in which a collection of pus develops near the anus. Most anal abscesses are a result of infection from small anal glands. w hile dog anal glands problems are usually not life-threatening, with the exception of anal gland cancer, they are relatively common and can affect your dogs quality of life. the anal glands are located at the 4 and 8 oclock positions just inside of the anus and must be expressed gently. If you notice the liquid is yellow, pus-like, or red that means they anal sac is infected and requires medication. In serious cases, an abscessed anal gland might require surgery. anal gland disease itself occurs due to impaction, also known as a blockage of the two ducts that remove the excretions of the dog anal glands out via openings on either side of the anus. when the glands fill with pus, they may burst inward, releasing their infected contents into the spaces around the rectum and anus. This pus causes an abscess, or pus collection, in the spaces surrounding the rectum or anus. The anal abscess may enlarge, causing pain, fever, and difficulty with bowel movements. Characterized by swollen, red swelling on either side of a dogs anus, anal gland infection is caused by bacteria that enters the gland, most likely through the duct. Affected dogs may bite or lick the area beneath their tail, or scoot their bottoms on the ground to alleviate discomfort. anal glands typically do not a cause of concern for dogs except for when the glands become clogged or infected. Common problems include pain and discomfort arising from anal gland impaction and anal gland abscesses. a blocked anal gland, a sexually transmitted infection (sti), or an infected anal fissure can cause anal abscesses. Some other risk factors include crohns disease or ulcerative colitis, which.