Heyy, Well my horse had the same sutuation when I first bought her, she rubbed her main off in her olf home, so it was differnt lenghs. With some help, we cut it, with razor scissors, and now it has grown to normal length and looks beautiful

,, Good Luck! Let us know how you do it. Also I would probaly go with pulling the mane, I would of if I knew about it back then

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