It's illegal to own just one guinea pig in Switzerland because they get lonely

In Switzerland, it is a crime to have a lonely guinea pig. In 2008, the Swiss government decided that it was cruel to leave a guinea pig without a friend and introduced an animal rights law that made it illegal to own only one animal. Guinea pigs are highly social herd animals, and therefore require at least one other guinea pig with them in order to feel comfortable and happy. So if you are looking at buying a guinea pig, in Switzerland or any other country, think about buying two, because everyone deserves a friend.