Why is it illegal to own a guinea pig in Switzerland?

Here are today's Did You Know, Or Do YOU Care Fun Facts! (2/11/20 Version):

 German chocolate cake is named after a guy named Sam German, not the country.

There are actually more public libraries in the US than McDonald's. (yes, but do the libraries have fries?)

Before the invention of color TV, 75% of people said they dreamed in black and white. Today, only 12% do. (Doesn't 12% seem high? I don't think I've ever dreamed in black and white)

It's illegal to own just one guinea pig in Switzerland because they get lonely. (That is just the SWEETEST thing!)

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