Blood in the dog's stool may be caused by internal parasites, gastrointestinal diseases, improper diet, internal heat, parvovirus, etc. It needs to be sent to the pet hospital for examination and treatment in time to avoid delaying the condition. Do not feed your dog sharp and hard food, such as bones, fish bones, etc., especially chicken bones, which can easily scratch the stomach and cause gastrointestinal diseases. Regularly deworm your dog's body to avoid the production of internal parasites.