I think my 20-year-old horse has started to show signs of this. I spoke with the vet and we are monitoring it.
I understand it can be genetically related and tends to affect the thicker body type horses. 
What therapies have you used and was there any success? Thx!
A barn friend started her horse on the Equine Complete Omega oil (i think thatās the name of the company). It helped her horse to start sweat again. We think the grass quality was a major factor and getting a ton more vitamin e helped.
I am going to follow this thread! A friend at the barn I board at has a 20 year old gaited pony who just recently stopped sweating. She just started him on One AC so we will see if it helps. She has also been told that cheap beer works. She was a little heisitant to try that, so she is trying the One AC.
An update: Since lack of sweating can be a sign of Cushings, I had my guy tested and the test came back yesterday as positive for cushings. Iām a little thrown as this is my heart-horse and I know this disease is awful. I just started him on Prascend and will be trying the OneAC. Iāll let you guys know if anything works.
Sorry to hear that @Dressurfrau. I used One AC for many months on my non-sweating horse and it never did anything for him. Fingers crossed it works for you!
I cared for a Cushings horse for years that was on prascend/pergolide for years. He too quit sweating the last few years and we tried many things including and up to beer. What worked best was acupuncture by far. After treating with acupuncture never had a problem again with him not sweating.
I have a 23-year-old with Cushings and anhidrosis. Your horse can come hang out with mine. 
I used One AC for years with OK results but Platinum Refresh has been a game-changer for my horse. (Link goes to a thread I posted on the subject last year that discusses a variety of products.) I have him on the recommended 1 scoop per day (half AM, half PM) for most of the summer. Like One AC, horses do develop tolerance and you can increase the dos. For either product, if you up the dose to help the horse deal with a hot week, do drop it back down so that they donāt continue to develop tolerance as quickly. I am in the Mid-Atlantic and humidity is the real killer for my horse, so I keep an eye out for particularly hot and humid days and proactively change the dose accordingly. Thus far this summer, this dosing has enabled him to continue in his normal work and sweat appropriately for his level of exercise.
Under the heading of āmanaging his lifeā:
If you use box fans from Target, do your horse a favor and get him a sealed-motor agricultural fan. Mine cost about $90 from Northern Tool. They are not only safer to keep running without supervision, but they also move substantially more air, and they make a big difference in your horseās environment.
The fitter and more acclimated he is at the start of the hot season, the better he will do. This will probably not help you until next year. Another issue that is often seen alongside anhidrosis is respiratory difficulty, so keep an eye on his breathing as he exercises. MSM wasnāt the right answer for my horse (though my vet recommends MSM and Vitamin C as effective for many of her anhidrosis patients) but he does well on Yoderās Horse Powder daily and OmegaAlphaās RespiFree in the worst weather.
Cushings sucks, and so does anhidrosis, but with prudent and attentive management neither one has to ruin his 20ās.
Thanks everyone for the advice! I do have fans in all of our stalls they are the safe and sturdy sealed-motor ones for a barn environment. Box fans scare me!
I have a months worth of One AC to try. If I donāt see good results, Iāll probably try the Platinum Refresh.
Iāll keep posting on his progress.
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