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Heat Intolerance with Anhidrosis

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  • Heat Intolerance with Anhidrosis

    Anyone have any experience treating sever heat intolerance?

    I have a horse that I recently leased that has suddenly (with the heat) stopped breathing right. The vet checked him this week and indicates it is heat intolerance. At rest he is breathing at about 40 bpm - and I am told normal is 10-20. If we put him in front of a fan we can get him down to 15 but even with very light work (5 minutes of trotting) he was up to 82! This was on an 80 degree day with normal humidity.

    Once his breathing is elevated he can not cool down - except with water and a fan. Walking makes it worse not better. At the vets recommendation I have ordered One AV from Smartpak. She is not overly optimistic this will work but we all thought it is worth a try. Vet is also concerned about long term health implications associated with not getting enough oxygen including issues with the heart, lungs, liver and brain.

    Has anyone experienced anything similar?

  • #2
    Yep, my big Irish horse doesn't sweat well. This time of year I go out and hose him down at lunch and then a few hours later. Standing in the shade being sprayed with cold water and scraped off, and especially spraying inside his hind legs where the big blood vessels pop out, helps a lot, and his breathing will slow down.

    He gets turned out at night / early morning. Otherwise he will stand in the sun to eat grass and then overheat (which means an emergency vet call to get fluids into him. Happened once at the boarding barn, I have more control now that he's home.)

    He's old and not ridden much, but if I were going to ride I'd get up early and be done by 8 or 9 when it's still reasonably cool.

    Some people suggest giving them Guinness (beer) to make them sweat again, I haven't checked into the recommended amount or anything.

    Do you mean OneAC?

    ... and Patrick


    • #3
      For about 4 years, I tried everything with mine - all the supplements, beer etc. Nothing really helped. My vet said she was one of the worst cases he had seen. The poor mare was miserable from June to October. I had a number of calls at night check (11:00 pm) that she was overheated - had to go out and hose her! I also used one of those evaporative cooling sheets on her. It helped a bit but you couldn't leave it on unsupervised. Eventually we sold her and sent her North - the only real solution for a serious case.


      • #4
        One AC helped two of mine. One stopped sweating after being on an antihistamine and the One AC got him started again. The other sweats, but not nearly enough. So the One AC is worth a shot. It took a weeks or so to become effective and for some reason I got a better result when I added a small amount of salt to their diet.(about 1/4 teaspoon, they are ponies).


        • #5
          I had one who wouldn't sweat for anything. Always make sure she has shade, hose a few times a day in hot weather, and try everything. There are some Chinese herbs that are supposed to help, too. They didn't help mine but she was a hard case. If you live in the South you may have to rehome North.


          • #6
            My gelding went through exercise intolerance which triggered anhidrosis that lasted a few years and then he normalized.

            His exercise intolerance started almost suddenly in the middle of summer. He was out of shape and we were slowly increasing work, and it was during an unusually hot spell, so it took a couple weeks to realize what was going on.

            He was fine in the shade, but would start labored breathing just by being in the sun. W/T for 15-20 minutes left him exhausted and heaving to catch his breath. It would take 45 minutes for him to recover fully.

            I actually thought it was early onset of cushings, he's predisposed, though he was only 12 at the time. Vet came out for bloodwork and surprise surprise, diagnosed thumps. She gave us a protocol for when he would have spasms and I was able to keep it at bay. Work pretty much came to a halt for a while.

            In time, the thumps resolved with a balanced diet, but then anhidrosis set in. I tried just about every product on the market that summer, and the following, with limited success. One A/C did work the best, but never fully solved it.

            There was a rash of anhidrosis questions on this forum that summer, and some passing poster offered a home recipe that worked for them. It worked for us as well. The next season he was sweating fairly well. The following season he was back to normal, and has been ever since.

            IIRC, the recipe was a mixture of 1 part "lite" salt, 1 part regular salt, 1 part sugar. I would mix a batch and feed about 1oz per day. I used iodized salt as I was using FeedXL at the time and it indicated he was low in iodine.

            I wouldn't suggest trying anything without your vet's clearance first though.
            Being terrible at something is the first step to being truly great at it. Struggle is the evidence of progress.


            • #7
              Electrolytes are the only thing that has ever helped mine, but they help quite a bit. He's still sweating and breathing normally right now, and it's mid-July. I hate to tell you that in past summers where he struggled the only thing that helped was for the temperatures to come down. I keep him on electrolytes now from May to September.


              • #8
                This article from Dr. Ramey crossed my FB feed today and I remembered this thread...

                ... and Patrick


                • #9
                  Is he on alfalfa? If so, change him to grass hay.
                  Only two emotions belong in the saddle: One is a sense of humor. The other is patience.


                  • #10
                    My large 7 yr old hanoverian gelding has anhidrosis for 2 summers now. He is very fit (in full h/j training) and not overweight. He is on electrolytes 8 months out of the year.

                    I started One AC last summer and didn't notice any a change, then started it again at the beginning of April this year- no luck at all. I have read many people saying they had luck with 2 to 3Xs the recommended dose. I stopped it since it was pricey and not working.

                    He's been on those Chinese herbs that my vet recommended for a little over a month now. No change so far (they are pricey, about $100 per month). I also just tried the Equiwinner patches (a 10 day treatment). They didn't do anything, but supposedly come with a money back guarantee. I just emailed to inquire about my refund.

                    I just ordered a gallon of Equine Omega Mega Sweat, which is chocked full of vitamin E, another thing that I heard can help. Fingers crossed it works. Also pricey at $90 a gallon.

                    basically..... best of luck! If you find something that works, please share!
                    A blonde & her hunter:


                    • #11
                      I had no luck with any of the supplements. I sold him to a home in Ohio. We tried everything.


                      • Original Poster

                        So a year later and he is doing fairly well. I could not let him go when the lease was up and just decided to purchase him - despite the issues. The One AC has worked really well overall. I kept him on it till the end of October with a plan to start back up June 1. Unfortunately we had a really hot week suddenly in May and that has been the only time he has struggled since last summer. Next year I am going to start him May 1st to be safe. This year I also added in electrolytes. The combination has kept him stable even in the worst of the Chicago heat and humidity. That said, I also take it easy on really bad days or just don't ride at all and then I cool him first in front of a fan, hose, then back to the fan. All in it has been fairly manageable and he is a saint of horse that is teaching this old dog how to jump so I am happy that I decided to keep him. Thanks for all the advise


                        • #13
                          I'm glad he is doing better and you are happy with him.... not much more to want
                          Caring for Clifford, my big red dog and assorted monkeys, I mean goats. Protected by a few loyal Anatolian Shepherd Dogs and Kangals.