I would have thought he was dreaming about Arwen and then when the horse came and started, well, nuzzling his face he just put the two together. I'm guessing that they used Elvish because the more awake film fans would remember "Gandalf, what's the Elvish for friend?", while if he started muttering in Rohirric very few people would get it.
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“Sylphs of the forest,” I whispered. “Spirits of oak, beech and ash. Dryads of Rowan and hazel, hear us. You who have guided and guarded our every footstep, you who have sheltered our growth, we honour you."
the Forbidden Link
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