What does it mean when your guinea pig's body vibrates when you are petting it?

HAPPINESS!!!

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When my pigs did that it seemed they were very nervous about being held they did not like it

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its their anoyyed sound it means stop petting me tere or i didnt like that

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As long as the guinea pig is not trying to get away from you, then this vibrating is most likely just a guinea pig purr and is doing so to show it is happy or content

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My daughter's guinea pig vibrates when it hears a female's voice...when my husband talks to him, he doesn't vibrate, but when I talk or my daughter talks to him, he vibrates while we are speaking! We think it's because he's happy and feels comfortable around girls!

Answer

It sounds as though it's a guinea piggy purr! S/He loves it!!

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