It is normal for a dog to not poop for a day, and owners do not need to worry too much. If a dog does not defecate for three days, it may be constipated. You can feed the dog some probiotics to promote gastrointestinal motility. If it still does not improve, take the dog immediately. The dog goes to the pet hospital for examination and treatment. You should pay attention to your dog's diet, avoid overfeeding, and take your dog to exercise more to enhance the body's immunity and promote metabolism.