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January 26, 2017


Sandra Nester

I don't think you need to worry. If I were to look I would find many different colored pee spots. In my world, I just glad they pee. : )

Todd Chrisman

I found a free link to the article.


LOL we have seen this for years in the winter usually, have always related it to chewing on tree bark which all our horses do. Ash and maples are favored, oak and pine are least favorite. We find discolored urine spots in the sawdust of the stalls too, not always but often enough. If they aren't chewing on tree bark or firewood logs the color goes away. Don't worry! (PS, heating the water tanks is a great thing regardless, it will get them to drink more and save you a lot of work.)


Clovers are particularly useful because they can be used to improve pastures and hay fields by frost seeding. The clovers, however, can also produce slaframine which is known as the "slobber factor." Slaframine will make horses salivate profusely. This is commonly seen in some parts of North America. Red clover has also been associated with red urine in some horses. Porphyrins are excreted into the urine and will oxidize and turn red. This is usually seen during the winter when horses urinate on the snow.


Found it! "pyrocatechines"

Normal horse urine sometimes turns red or brown after standing for a while. This is due to the presence of oxidizing agents termed "pyrocatechines". The red spots, are a normal oxidative process that occurs after the urine has been voided.


Most excellent.
I was told that the clover produces the slaframine in prolonged damp weather--like we had here in Maine this past summer. The dense clover I planted along the steep slopes on part of the driveway got red tinged and many of the plants had leaves that had turned red by mid season. I was told not to graze the horses on it when it was red like that because they get sick with "slobber". I gues slobber is a very uncomfrtable condition but not life threatening and will resolve in 24 -36 hours after removing the tainted clover from the feed.

Thanks so much, all you folks. Every time I ask, you guys always come through to make a post better!!

Ron - Horse for Sale Place

Okay I love your blog.. Now I have lived in the snow before and never have I seen tanted urine spots?

I will go hmmmmm. But now living in Frigid So Cal, we dont have to worry about that. Just Colic, these horses get so spoiled they are like pure breed dogs.

Love a good Mutt! I am glad to hear that your horses are doing well again.

Happy Juice! That is funny.. (I flash back)

Happy Trails..


Glad to see someone else obsessing about this subject! I have a healthy haflinger gelding- a tried and true TREE EATER, one of 4 horses in a pasture who leaves giant scarlet red puddles on the clay soil (urine appears normal when coming out)or in the hay tubs(his aim is excellent). He did this even when fenced off from all trees for 4 months!


we have a new forret gelding,when he urinates it runs to the bottom of his stable and sits there till i wash it away but i have noticed its a reddish brown colour is there any need to worry? he his still his normal self and i have looked through his straw were he as urinated and its just normal theres no blood.does anyone know why iam worried about it.


I am so glad that you posted this. I normally board my horses out and this winter I was able to afford putting my fence up. I was so excited.. Then recently I went out there and saw all these orange colored pee spots. Well , I was pretty frieked out... The first thing I though was cancer.. I have two and didn't know which one it could be.. so I waited and watched until one peed.. Of course I ran out there and there was two spots right next to one another.. One yellow and one orange.. well , that didn't work so I came back in the house and began searching on the internet...

So thank you for posting.... and I am not too worried anymore.. maybe just a little.. :-)

Fenton , MI


Oh thank you. I just went out to feed and water and saw in the snow exactly what your picture shows. My first thought was one of my mares cycling, but found mares generally don't cycle in the winter. Then I got worried. So thankful for this post.


I live in northwest CO and have found that horses that are fed hay with slew grass {grows in low wet areas} in it will pee bright orange . The grass is commom in all wet slewy areas It has never caused a problem in my horses and Ive had horses for 60 years

catherine palmer

thankyou! I was begining to think my fat, sassy, spunky mare was at death's door!

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