LoL, it looks like he's saying, "Blehhhhh!"
Here are a couple of silly ones that I have on my computer...
The first one is Annie (my horse), taken at a completely odd angle, which makes her large, plain head look extremely
plain and large (lol, I swear, it's not quite as bad as this picture depicts). Not to mention she is a skinny, gangly thing...my boyfriend calls her "heifer" because he says she looks just like a milk-cow.
The second is a Morgan cross mare we know and love, named Sunshine, mid-yawn.