Preheat oven to 300°F (150˚C)
Mix all dry ingredients together.
Add liquid ingredients and stir with a strong spoon to form soft dough.
Flour hands and counter top to keep dough from sticking. Empty the bowl onto the counter top. Knead the dough by folding it on itself several times until smooth, proceeding as if making a pie crust.
Roll dough to no more than 1/2” (1.25cm) thick and smooth in place on a cookie sheet, kneading into corners. Cold dough can be easier to work with. You can freeze or refrigerate for a short time if having trouble rolling dough out.
Prick the dough, from end to end and side to side, with a fork to prevent bubbles. You can make biscuits out of the side strips.
Bake for 30 minutes. Don’t bake so long that the edges get brown and brittle.
With a large chef’s knife or pizza cutter, cut the newly baked slab into 9 or 12 parts on a cutting board. Cut twice horizontally, and then cut vertically 2 or 3 times. Cut each of the resulting rectangles into kibble sized pieces by cutting first in one direction and then the other. Piece sizes are determined by the size of your dog.
Separate kibble pieces onto two or more cookie sheets and place in a warm oven (at its lowest temperature) for two or three hours, until crunchy dry. Direct sunshine makes an energy efficient drier, too. Kibble is dry enough when you can’t compress the pieces with finger pressure.
Refrigeration is unnecessary.