Preheat oven to 350°F / 180°C / Gas mark 4. Line baking sheet with parchment paper, and set aside.

Grind oats in a food processor, or blender, then measure 2 1/2 cups. (You'll need about 3 cups whole oats). If you prefer to leave the oats whole, the dog biscuits will have a coarser texture.

In a medium mixing bowl, combine oats and almond flour. Whisk to combine.

In a smaller mixing bowl, whisk egg with honey, coconut oil and 1/3 cup (80ml) water. *You may need more water, reserve the remaining water for now.

Pour the wet ingredients over the oat mixture and stir with a sturdy spoon or rubber spatula.

Fold in cranberries and work them into the dough. If dough feels dry, add in a tablespoon or two of the reserved water. The dough should hold together when you squeeze it in your hand.

Lightly flour the countertop, and use a rolling pin to roll the dough out to 1/8 - 1/4 in. thick. Use a cookie cutter to cut out the treats and place them on the prepared baking sheet. Re-roll the dough and cut out treats until all of the dough is used.

Bake for 22 - 25 minutes, until golden brown. Remove from the oven and let the treats cool slightly on the baking sheet before transferring them to a cooling rack to cool completely. *Never feed your dog treats hot from the oven.