I don't know if horses pray, but they certainly do have their heads bowed a lot! Except I'm pretty sure they're eating, not praying.
The reason for this particular post is to explain why I use the name Praying Horse. It is all based on a tattoo I gave myself for my fortieth birthday (fine, that would be 12 years ago) of a naked woman on horseback praying to the moon. I got it during a time when I was recovering from a relatively nasty horse wreck, i.e. I fell off and it hurt for a long time after, and wanted to celebrate my forgiveness for both the pain and the horse who tossed me off.
The image of has thus far resisted being captured via photograph but perhaps someday if I ask nicely enough, the pair will grace this page.