The dog has absent, infrequent, or difficult and strained defecation. Stool is often hard and dry. If the dog passes many small stools containing mucus or blood, it may be colitis instead of constipation. Causes could be age related, ingestion of foreign bodies, less water intake, trauma, anxiety, less exercise, or conditions like intestinal blockage, conditions of blood or hormones, drugs, and muscle weakness or even behavioral.
