Lor, I've had lots of guinea pigs myself, including my own and when my daughter was little. They are stinky little things and they sure do pooh a lot. They are veritable poop shoots.
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I thought mine were cuddly though. I loved when they would do that chortle.

But yeah, they do get stinky.

Not that parts of hamster cages don't. My daughter cleans out the 'toitey' section of their hamster cage very often.