Unless your pig is confined to your house for long periods of time, it should go outside to potty. This is not always possible, because many pig owners work away from their homes all day. Also, many pigs like to go potty most often at night, when you aren’t awake to take your pig outside. Therefore, using a combination of outdoor and indoor potty training is the best strategy. You’ll be pleased to know that with the right technique, you can potty train your pig in as little as one to five days.
Potty Training Inside the Cage - Put hay in an accessible litter box. The triangular corner litter boxes work with a small towel or a hide placed over them to make the guinea pig feel safe and encourage it to use the box.
Know your guinea pig's litter preference. Some guinea pigs prefer to go on paper towels or regular towels instead of newspaper or hay.
Keep in mind that guinea pigs tend to go to the bathroom where they eat and sleep. This is where you want to place the litter box or newspaper.
Observe your guinea pig to find out its favorite potty spot and put the newspaper or litter pan there.
Place a few of your guinea pig's droppings in the litter pan or on the newspaper to encourage it to go there.
Potty Training Outside the Cage - Limit the area size and length of free run time at first. Use a small kitty litter pan for floor time. Cut one of the sides down and sand it smooth for easy entry. Place a towel or newspaper underneath.
Add newspaper or hay. Put a couple of droppings in the pan for encouragement. Put a small stool or end table over the litter pan. Guinea pigs feel more secure when they can do their business under a shelter.
Let the guinea pig run around on the floor. Put it back in its litter box and wait for it to do its business. Take it out afterward, and reward it with praise or food.
Hold your guinea pig, and when your guinea pig eliminates on you, say "No, bad," followed by its name. Put it back in the litter box and leave it there for about five minutes.
Repeat this process several times or until your guinea pig is trained. Remember to use plenty of praise and food rewards.