Anna I have always said this- if you restrict and then allow free access for a very limited time the horse just makes up for lost time and fills it's face as quickly as it can, in exactly the same way that if you allow a thirsty horse free access to water it will actually drink to the point of doing itself harm. I HATE muzzles, but am slowly accepting that a grazing muzzle does have a place, and it is far better for the horse to be out all the time (weather permitting) and grazing, even with a muzzle on, than to be on restricted grass. As far as the horse is concerned, the minute it cannot/is not eating, it is starving to death, as it's system is telling it to graze - normally on pretty sparse or rough grass, up to 22 hours o/o 24. This why you get stall walking, cribbing, chewing and eating inappropriate things (pica) . I am seriously thinking of getting a grazing muzzle for two of my mares, for next year. So long as it is on a quick release, safe halter, I think it may work.