Anal sacs are two sacs that are the size of or smaller than a pea. They are canine anal gland relief the sides of the dog anus at about 9PM and 3PM. Normally, the anal sacs canine anal gland relief when the dog has a bowel movement, but sometimes they don't empty as they should, causing them to possibly become irritated or infected. Symptoms associated with a problem include odor, a dog scooting the rear across the floor and other signs of discomfort. Perianal infection infection around the anus can also cause problems. Treatment includes antibiotics for any infection, and manual manipulation of the sacs to drain any fluid.