Recipe: Spinach and Cheese Biscuits

I've been trying different recipes to make green and red dough for dog biscuits. My raspberry biscuits did not turn out red at all but these spinach and cheese biscuits had a bright green dough which was very fun to work with. The final product was not nearly as green as the uncooked dough (the photo doesn't really capture the green tinge the biscuits have) but still smelled deliciously cheesy. Here is the recipe:

2 Cups unbleached, all-purpose flour
1 and 1/4 Cups whole wheat flour
1 Cup shredded cheese (I used a five cheese mix)
2 T oil (I used canola) - divided
3 Cups spinach leaves - divided
water sufficient for processing

1. Stir the flours and cheese in a bowl to blend thoroughly.
2. Put 1 and 1/2 cups of the spinach leaves in the food processor along with 1/4 cup water and 1 T of the oil and process until well chopped. Add half the flour/cheese mixture and another 1/4 cup water. Process until a ball of green dough forms. Remove dough, roll out and cut into desired shapes.
3. Repeat steps in #2 with the remaining ingredients to form a second ball of green dough.
4. Place cookies on greased cookie sheet and bake at 325 degrees F for about 30 minutes.