I am not sure I think there is anything "magical" abou the Mearas...beyond a remarkable bloodline, carefully nurtured by the Rohirrim and reserved like anything of the finest quality for the greatest among them ..Shadowfax....well he may come almost into the Huan category.....
I know that Tolkien felt that Elves had an instinctive understanding of animals and so I don't think Asfaloth's obedience is implausible even if he were an "ordinary" horse albeit reared and schooled by elves.... I suppose it is simplest to view the term "elf horse" as being used merely to distinguish it from the black riders horses..... and maybe Glorfindel always had white horses..... like some people always buy the same make of car..
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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