# U.V. Light and cat and dog urine.

**URL:** <https://boards.straightdope.com/t/u-v-light-and-cat-and-dog-urine/113949>\
**Category:** Factual Questions\
**Created:** [June 13, 2002, 11:46pm UTC](https://boards.straightdope.com/t/u-v-light-and-cat-and-dog-urine/113949 "2002-06-13T23:46:43Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![enipla](https://avatars.discourse-cdn.com/v4/letter/e/54ee81/32.png) [@enipla](https://boards.straightdope.com/u/enipla)\
**Post date:** [June 13, 2002, 11:46pm UTC](https://boards.straightdope.com/t/u-v-light-and-cat-and-dog-urine/113949/1 "2002-06-13T23:46:43Z")

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Cat urine shows up under ultra-violet light. Does dog urine show up too? Unfortunately, I’m not just curious, I need to know.

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**Author:** ![jk1245](https://avatars.discourse-cdn.com/v4/letter/j/49beb7/32.png) [@jk1245](https://boards.straightdope.com/u/jk1245)\
**Post date:** [June 13, 2002, 11:57pm UTC](https://boards.straightdope.com/t/u-v-light-and-cat-and-dog-urine/113949/2 "2002-06-13T23:57:25Z")

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Yep, it does.

I wish I didn’t know that for a fact, BTW.

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**Author:** ![enipla](https://avatars.discourse-cdn.com/v4/letter/e/54ee81/32.png) [@enipla](https://boards.straightdope.com/u/enipla)\
**Post date:** [June 14, 2002, 2:08am UTC](https://boards.straightdope.com/t/u-v-light-and-cat-and-dog-urine/113949/3 "2002-06-14T02:08:32Z")

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Thanks jk1235,

Kinda thought that was the case.

Shit… or I mean piss… We are doing a lot of work on the house right now, and the vet thinks the cat (in question) may have a stress problem. Kitty valium is one way to go. Wonder if I can get some for me. 🆒

How much beer can a cat drink anyway? Might be a little counter productive though. 😉

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**Author:** ![CrankyAsAnOldMan](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/crankyasanoldman/32/11670_2.png) [@CrankyAsAnOldMan](https://boards.straightdope.com/u/CrankyAsAnOldMan)\
**Post date:** [June 14, 2002, 5:49am UTC](https://boards.straightdope.com/t/u-v-light-and-cat-and-dog-urine/113949/4 "2002-06-14T05:49:17Z")

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I have one of those lights and it says that all sorts of things will show up, including blood and saliva.

But so far we’ve only used it for cat and dog pee. And to demonstrate that lumber from a coffee tree actually glows under such light.

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**Author:** ![Peanuthead](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/peanuthead/32/360_2.png) [@Peanuthead](https://boards.straightdope.com/u/Peanuthead)\
**Post date:** [June 14, 2002, 6:49am UTC](https://boards.straightdope.com/t/u-v-light-and-cat-and-dog-urine/113949/5 "2002-06-14T06:49:16Z")

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Human pee will show up too.  
Looks just like cat/dog pee. :eek: