Dog diarrhea that resembles chocolate sauce and has a foul odor may be caused by intestinal bleeding, parasitic infection, canine distemper parvovirus infection, etc. The dog's condition needs to be observed. If your dog appears to be in low spirits, loss of appetite, vomiting and diarrhea, etc., it is best to take your dog to the pet hospital immediately for examination and treatment. If your dog has no other symptoms, you can feed your dog some probiotics to regulate its intestinal tract.