My horses have it total 2 days. Two horses had them removed before I got home from work and two others had large cavities. Although they were all the same size and stretch, one size doesn't fit most. Surprisingly I got one on my Appy's big head, no problem but it took me a hell of a time to get another one on my QH's small head. They were cheap enough - thank God - because they were useless.
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