Dear Kaylee,

I purr all. the. time. I purr when I get a good question like yours. I purr when I finish answering a question. I even purr when I’m struggling to find an answer.

Luckily, Dr. Sarah Guess says that’s normal. She’s a veterinarian at Washington State University. She told me that cats purr when they’re content and when they’re stressed out. It can be a little confusing for humans.

Scientists have two ideas about why cats purr. It could have come from the way mother cats care for kittens. Or it could keep their bones and tissues healthy.

But experts don’t agree on the answer yet.

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