I am looking for information on grazing muzzles. I have a 16 y.o. mini. Last year she foundered, fortunately my farrier did a great job and she's back to normal now. I don't want to go through that again. I have 5 acres of pasture and use electric fencing, unfortunately, this pony seems oblivious to the fence. I can put her in  a wooden-fenced paddock, but it seems so cruel to keep her away from her buddies. (I know it would be crueler to allow her to founder on the grass again) -So I am thinking about a grazing muzzle. Do these things work? Do they annoy the horses, or chafe?  I looked at one at country supply, but the hole on the bottom seemed so tiny that it couldn't let anything at all in, and would drive my mini nuts!

The other thing I am considering is, keeping her in the small dirt paddock with one of those roller things (I am not sure what they're called) that allows grain to come out slowly. I'd put forage extender pellets in that to keep her busy.

Any information from anyone who's had experience with these things would be appreciated.

A grazing muzzle works great if you can keep them on. My ponies would work theirs off.  Then you have the risk of them getting hung up with the halter on.  My ponies stay in a dirt lot.  To some it may sound cruel, but this way I can monitor what they get to eat.  Grass hay and 1 cup of oats twice a day.  Hate it for them, but I've never had a pony founder yet.  I do turn them out in an overgrazed pasture about May after the spring grass is gone.  So many good ponies are ruined because of founder.