Preheat oven to 325°. Line a large baking sheet with parchment paper and set aside.
Add all of the ingredients in a large mixing bowl. Mash the blueberries slightly and stir well until a ball of dough forms.
Place the dough on a lightly floured work surface and knead for about 5 minutes or until it is soft and elastic.
Roll the dough with a rolling pin until it is about ½ inch thick.
Cut out dog bone biscuits with a cookie cutter and place the biscuits on the lined baking sheet.
Bake for 12-14 minutes or until the biscuits begin to turn brown. Cool on a wire rack for 15 minutes.
Store in the refrigerator in an airtight container for up to 10 days.