Preheat the oven to 350°F and line a baking sheet with parchment paper.

Wash and chop the strawberries, leaving the blueberries whole.

In a medium bowl, combine the whole wheat flour and peanut butter and mix until the peanut butter is evenly distributed.

Add the chopped strawberries and whole blueberries and gently fold them into the flour mixture.

Add the egg and stir until the mixture starts to come together, then gradually add the water until a soft, workable dough forms.

Turn the dough onto a lightly floured surface and roll it out to about 1/2 inch thickness.

Cut the dough into small shapes using cookie cutters or a knife.

Arrange the cut treats on the prepared baking sheet, leaving a little space between them.

Bake for 25–30 minutes, until the treats are golden brown and set.

Remove from the oven and let the treats cool completely on a wire rack before serving to your dog.