There is some old research suggesting that cats purr, to improve their bones density. https://www.scientificamerican.com/article/why-do-cats-purr/ https://www.

There is some old research suggesting that cats purr, to improve their bones density. https://www.scientificamerican.com/article/why-do-cats-purr/ https://www.scientificamerican.com/article/why-do-cats-purr/