A Dog’s Anal Glands Expression, Anal sacs, or anal glands, contain bad odor and occasionally need to be expressed, or emptied. Many dogs express them on their own when they excrete; however, occasionally the sacs fill with fluid and your dog needs some extra help to release the fluid. At Rabocao, we offer dog anal gland expression within our grooming packages. If you’re looking for professional Miami Dog Anal Gland cleaning, look no further than Rabocao.