Preheat oven to 350 degrees Fahrenheit.
In a small bowl, mix together eggs and peanut butter using a whisk or hand mixer.
In a medium bowl, combine flour and oats.
Add the peanut butter and egg mixture to the flour and oat mixture.
Add half of the water.
Using your hands or a large spoon, combine the ingredients. The dough will begin to form. Continue until the dough is well combined and adding more water as needed.
Add the dried blueberries.
Push the dough down and onto the blueberries and work with your hands to incorporate the blueberries into the dough.
Place the dough on a work surface.
Use a rolling pin to roll out the dough to about ¼ to ½-inch thickness, to your preference.
Use a cookie cutter to cut out the dog treats.
Place the cut out pieces on a non-stick baking sheet. You can also use an aluminum baking sheet lined with parchment paper or a silicone baking mat.
Bake at 350 degrees for 20 to 25 minutes.
Remove the dog treats from the oven and transfer them to a wire rack to cool.