ok, so no brown rice, apples or carrots - that's ok
There are lots of flours that you can use:
Whole Wheat
White Plain Flour
Rye Flour
Barley Flour
And then you can add anything else that you want that they can have....
I will just throw things out there:
Peanut Butter ??
Butter Nut Squash ??
Celery ??
Zucchini ??
Berries?
Really all you need is
1.) A Flour
2.) Water
3.) A little bit of an Oil
4.) Endless - Anything else you want to mash up and add
To start - put all your wet stuff together (use only about 1 tbsp of oil, about 1/3 cups of 'whatever else' and mix that together). Then slowly add and mix the flour (probably about 1 cup), and then add some water a little at a time, probably no more than 1/4 cup. You'll have to play around with it a little, but it should pretty much be right on. Then roll out and use cookie cutters. Try to make them more on the flat side. Bake at 320 or 300 depending on how your oven cooks. Try baking for at least 12 mins and then test them, maybe they need a little more time - just watch so they don't burn.
That's all - it's really simple - and honestly, most doggies love ANY kind of cookie you give them, so it doesn't have to be too flavorful