# When do cats purr? **URL:** \ **Category:** Factual Questions\ **Created:** [November 15, 2005, 4:31am UTC](https://boards.straightdope.com/t/when-do-cats-purr/331118 "2005-11-15T04:31:35Z")\ **Posts on this page:** 4\ **Page:** 2
**Author:** ![spingears](https://avatars.discourse-cdn.com/v4/letter/s/ebca7d/32.png) [@spingears](https://boards.straightdope.com/u/spingears)\ **Post date:** [November 16, 2005, 12:53am UTC](https://boards.straightdope.com/t/when-do-cats-purr/331118/21 "2005-11-16T00:53:45Z")
> [@Gozu](#): > > In the wild, without human interference, when do cats purr? I wonder. WAG Just like the ads say, Contented Milk From Contented Cows, Contented Purrs from Contented Cats! ---
**Author:** ![Bippy\_the\_Beardless](https://avatars.discourse-cdn.com/v4/letter/b/ac8455/32.png) [@Bippy\_the\_Beardless](https://boards.straightdope.com/u/Bippy_the_Beardless)\ **Post date:** [November 16, 2005, 1:02am UTC](https://boards.straightdope.com/t/when-do-cats-purr/331118/22 "2005-11-16T01:02:03Z")
Don’t be fooled, they are digging escape tunnels. ---
**Author:** ![John\_Kentzel-Griffin](https://avatars.discourse-cdn.com/v4/letter/j/ccd318/32.png) [@John\_Kentzel-Griffin](https://boards.straightdope.com/u/John_Kentzel-Griffin)\ **Post date:** [November 16, 2005, 1:13am UTC](https://boards.straightdope.com/t/when-do-cats-purr/331118/23 "2005-11-16T01:13:04Z")
“Well, then, you see, a dog growls when it’s angry, and wags its tail when it’s pleased. Now I growl when I’m pleased, and wag my tail when I’m angry. Therefore I’m mad”. - Chesire cat ---
**Author:** ![dtilque](https://avatars.discourse-cdn.com/v4/letter/d/d6d6ee/32.png) [@dtilque](https://boards.straightdope.com/u/dtilque)\ **Post date:** [November 16, 2005, 5:33am UTC](https://boards.straightdope.com/t/when-do-cats-purr/331118/24 "2005-11-16T05:33:12Z")
I believe it’s been established that the vibration from purring speeds the healing of injuries, especially those of bones. There are medical devices meant to have the same effect and that vibrate at about the same frequencies as purrs. [Previous page](https://boards.straightdope.com/t/when-do-cats-purr/331118.md?page=1)