Toilet training a pet pig is similar to training other animals like dogs. You can start by designating a specific area for your pig to use as a bathroom, such as a litter box or a specific outdoor area. Whenever your pig goes to the bathroom in the designated area, be sure to reward them with treats or praise. Consistency is key, so make sure to take your pig to the designated bathroom area frequently, especially after meals or naps. Additionally, be patient and understanding, as it may take some time for your pet pig to fully understand and learn where to go to the bathroom.