When I make horse treats, I grind my sweet feed in a flour-type grinder. Makes the cookies stick together better. I cannot remember the exact amounts but I used:

Oats
Molasses (in place of sugar)
Ground sweet feed
Ground/chopped carrots
Ground/blenderd Apples with the seeds (seeds have sienide sp? which is proclaimed as toxic, however, only toxic to a cancer cell)
Salt
A bit of corn or olive oil. Mix it into a big globby, goopy, chunky, and otherwise fairly thick mess...toss in the oven 'til they stick and done!