Question: my guinea pig lives alone his entire life. Is it still useful to give him a friend?

Yes it is! We can never replace another guinea pig. We are not around for 24 hours and we don’t speak piggy-language. Is is not important how old a guinea pig is, he will always benefit from a friend. You will see the difference when they are together. Of course it is important that the characters of the animals match. This can be done in a good animal shelter with sufficient knowledge about guinea pigs.