OP: you'll be fine. do not throw out the treats.
as for the recipe, zmad2000's numbers are great. i find i have to tweak the amount of flour based on how dry the grain is. i start with less flour, add everything else, and then add flour as needed until i get the right consistency. it's an art, not a science :rockin:
bake at low temp for a long time. essentially you're trying to dry out the treats, typically takes me at least 2 or 3 hours.
protip: score (cut) the treats into small pieces before baking. use an old knife or pizza wheel to cut a fine horizontal and diagonal pattern. this will create "fault lines" in the treats and it'll make breaking them up a lot easier once they're baked and hardened.
i haven't come across any types of grains that upset my dog. she loves 'em all, from tripel leftovers (all pilsen) to stout grains (lots of dark malts). her only complaint is that i don't give her enough of them!