Asakiyume mita

That's what I thought too--I was saying elk but Wakanomori pointed out that the caption said moose. There are two possibilities, though: Currier & Ives could have drawn, or worked from, a picture of an elk thinking it was a moose, or the person who wrote the caption could have thought that it was a moose. But yeah, the shape of the head and the horns are all wrong.