Horse treat recipes that has grain?

Out of all the treats i've given Sonny to teach him to come to me, he responded better to grain than apples, carrots, and horse treats. So I wanted to make a "cookie" type thing that has grain in. I just find that the grain itself is extremely messy and I have nothing to put it in (though I'll be buying a bag to put it in so I don't have to use my pockets).

Any recipies that you all know of?

There are a whole lot of them at this site
http://www.carolinahorseandhound.com/TREATS.html

ETA there are also dog treats in there too.

Thanks!!!!!