Dreams

I have a dream dictionary, which tells me what the symbols in my dreams may mean (rarely accurately, of course).
I had a dream were a blue horse was swimming toward me in a river or ocean, and when it got to me, bit down on my arm to grab hold of me. Not to necessarily hurt me, I think, but rather to direct me somewhere.
Anyway, I could not find a listing for this in the dream dictionary. How strange--I figured everyone had dreams like this. ;)