This appears boosted from Schlegel Whitman's "Dog Parties", per the attribution. I don't know exactly if Whitman is a dog nutritionist or has had one, um, "vet" this, but it sounds marginally doable. Liver powder, surely a work of evil, is said to be available from health and nutrition stores.
Combine dry ingredients. In a mixer at medium speed, slowly add water to dry ingredients. Remove from bowl and allow to set for one hour before rolling out to 1/2" and forming with cookie cutters. Bake at 400F for 20 minutes.