If a horse or dog has worms in its belly, it will show symptoms such as loss of appetite, weight loss, bowed waist, and frequent or infrequent bowel movements. At this time, the owner needs to purchase internal and external anthelmintics and feed the corresponding medicine according to the weight of the horse and dog. The parasite can be killed by waiting for the drug to take effect, and it will be excreted by the horse and dog the next day. After that, the owner should deworm the horse and dog regularly to avoid causing physical discomfort.