A dog's loose green poop may be caused by indigestion, colitis, parasites, eating too much green food, or viral infection. It is necessary to observe whether the dog has other abnormalities. If there are no abnormalities, you can feed some probiotics appropriately to regulate the intestinal tract; if the dog has poor energy, loss of appetite, vomiting, etc., it is best to send it to the pet hospital for examination and treatment in time.