Extreme Weather. Hurricane Center; Climate Change; Winter Weather; Severe Weather
A. When untreated, pinworms can cause: 1  diarrhea. 2  significant malabsorption of food. 3  genital itching. 4  bedwetting (enuresis). 5  vaginal discharge which can be associated with genital skin irritation and rash.
Any of these may cause bloody mucus in the stool, but the two most likely to cause it are hookworm and whipworm. While many types of worms are apparent in your dog's stool or vomit, hookworms cannot be seen without a microscope and may instead cause bloody stool, anemia, weight loss, lethargy and diarrhea.