A bowel movement once or twice daily is normal for most dogs and cats. A poor quality diet with too much meat and not enough fiber is the usual cause of chronic constipation, it could also be caused by the animal eating bones, hair and feathers of outdoor prey. Animals who get too little exercises are often constipated too. The optimal diet--A good balance of protein, whole grains and vegetables. The change of diet may be all that is needed for chronic constipation. Always try to feed bran, fresh-chopped fruits, raw green vegetables, and whole-cooked grains. (Always feed veggies and fruits separately). Prunes, apricots, apples, and berries are all laxative and most pets learn to like them.