Louise's Zoo
Adult Guinea Pig
I don't think it matters whether they are in and out as long as their needs are met, which can be done both in and outdoors. Every keeper of outdoor pigs I have seen on this forum have made sure their piggies are well cared for, warm and safe. It's sad that some people think keeping them outdoors it cruel, but some will never change their minds. As long as your pigs are happy and warm, with full bellies who cares?
I was the opposite! When I first looked into to getting mine, I thought keeping them indoors might be cruel. I still feel like they are missing out by not having outside time but I think they have a nice home and a good life despite not being able to have time on grass in the fresh air.