This video shows how I trained my Guinea Pigs to use the litter box. This worked for me. It will probably work for you. Do not harm your guinea Pigs or deprive them of using the restroom. Keep them out in your lap for 15 minutes maximum while training to avoid harming them.
Anything you do is at your own and your animals own risk. I am not a veterinarian and I am not giving professional advice.
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