(i considered posting in Horsekeeping, but that's for non-PPID horses, right?) 
 https://innovativeequestrian.com/ols/products/cool-heat-horse-rug\
I'm considering getting this blanket for my 19 yr. old PPID horse, who has a thick coat all year round, and I do not clip him. We are in Wisconsin and he is outside 8 hours/day, then in a stable which has heat which is used to keep the indoor temp around 45-50 degrees fahrenheit in the extreme cold.  I can pay extra to have the rug put on when he goes outside, taken off when he comes in.  I'd like to allow him to thermoregulate naturally as much as possible.  Has anyone used this blanket, any opinions?  Thank you--
Patty and Inky
https://ecir.groups.io/g/CaseHistory/files/PATTY%20AND%20INKY
https://ecir.groups.io/g/CaseHistory/album?id=268362
horse located in SE Wisconsin
owner located in north suburb of Chicago
joined Aug 2019

With the long thick coat he shouldn't have any trouble handling the winter. This blanket, if it even works, won't help in the summer. It's only rated up to 64F.
--
Eleanor in PA

www.drkellon.com 
EC Owner 2001
The first step to wisdom is "I don't know."

P.S.  It is important to realize that a PPID horse is not capable of doing many things "naturally" like a normal horse - including shedding and temperature regulation. When pergolide doesn't correct these, you need to step in to keep the horse comfortable with clipping in hot weather, blankets if the horse shivers in cold.
--
Eleanor in PA

www.drkellon.com 
EC Owner 2001
The first step to wisdom is "I don't know."

Here's my (ill-founded) logic - his coat is so heavy he doesn't need a blanket, and any shivering he would do would help him lose weight!  Glad for Inky's sake you've set me straight.  Thank you
--
Patty and Inky
https://ecir.groups.io/g/CaseHistory/files/PATTY%20AND%20INKY
https://ecir.groups.io/g/CaseHistory/album?id=268362
horse located in SE Wisconsin
owner located in north suburb of Chicago
joined Aug 2019

you wrote:

and any shivering he would do would help him lose weight

I’m not sure that a good thing. Shivering means they’re cold. And you need to blanket. Unless I’m missing something?
LJ Friedman  Nov 2014 Vista,   Northern  San Diego, CA

Jesse( over the rainbow) and majestic ‘s Case History 
Jesse's Photos

 

You didn't miss anything; it was just my dis-ordered logic
--
Patty and Inky
https://ecir.groups.io/g/CaseHistory/files/PATTY%20AND%20INKY
https://ecir.groups.io/g/CaseHistory/album?id=268362
horse located in SE Wisconsin
owner located in north suburb of Chicago
joined Aug 2019