My horses that I tried grazing muzzles on hated them and ended up sore and where they tried to rub them off
I have a mare that has IRS and two others that I consider high risk due to breeding and they get fat on thin air.
I found that restricting grazing using small fenced off areas didnt work as they either jumped out or paced up and down all day so I use stabling to restrict the hours they spend out in the field
They all go out on a daily or nightly basis (depending on the time of year and I've managed to avoid any laminitis attacks - being fed a sweet mix while on a boarding yard was I'm sure to blame for my old mares problem
I also feed a chromium supplement that many vets are finding has a positive effect on horses with insulin problems
I think that is what would happen to my mare. She would try forever to get a muzzle off and end with sores.
We really don't know if what I was feeding her caused the hoof separation problem or if it was a lack of proper minerals or a combination . We've got her on Ca trace now and her feet are "purdy"
. But that sure isn't something I want to have to deal with again although, thank goodness it never bothered her in the least.
Just DO it and be happy that you can!