It's interesting (or maybe not) that more than 1,000 years before we meet Asfaloth, Glorfindel rode up on his "white" horse to meet the Witch-king. And my impression anyway, was that this horse would stand before the Wraith, although possibly due to Glorfindel...
Quote:
"... the air of special power and sanctity that surrounds Glorfindel -- note how the Witch-king flies from him, although all others (such as King Earnur) however brave could not induce their horses to face him."
JRRT, Glorfindel I, Last Writings, The Peoples of Middle-Earth
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And Asfaloth was white... I'm just sayin'
Although that said, it seems a bit rare to find any horse in descriptions published by JRRT that do not include the words grey or white.