Can dogs not express their anal glands?

Dogs cannot express their anal glands. The anal glands need to be cleaned frequently. If they are not cleaned for a long time, the anal gland fluid will accumulate for a long time, change color, emit odor, and cause blockage. It affects defecation, and in severe cases, the anal glands may become swollen and painful, making it impossible to defecate. If the dog's anal glands are not squeezed for a long time, the anal gland fluid cannot be discharged and will become putrid and deteriorate, stimulating inflammation of the inner wall of the anus and producing abscesses. The dog will become extremely uncomfortable, and in severe cases may cause constipation and anorexia.