For #6, I'm going to throw out a guess at HASUFEL, who's the only horse not already used with an AU in it (for gold). The only word I can make with the leftover letters is SHELF, but... no, hang on, it's FLESH, isn't it?
As far as #2 goes... okay, Hurin had a horse named ARROCH, which is made up of ROCH (Sindarin 'horse', so 'the thing' itself) + AR (Apricot Rolls). I... guess you wouldn't want a rock to 'happen' to Hurin? I don't know, I'm grasping at hay here.
hS
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