Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.

Place the mashed strawberries in a large mixing bowl.

Add the yogurt and honey (if using) to the strawberries and stir until smooth and well combined.

Gradually add the whole wheat flour to the strawberry-yogurt mixture, stirring until a soft dough forms.

Lightly flour a clean work surface, then turn the dough out onto it and gently knead until it holds together and is no longer overly sticky.

Roll the dough to 1/4 inch thickness.

Use a small heart-shaped cookie cutter to cut out biscuits and place them on the prepared baking sheet, leaving a little space between each one.

Gather and re-roll any dough scraps and cut more hearts until all the dough is used.

Bake for 15–20 minutes, or until the biscuits are dry on top and the edges are lightly golden.

Remove the biscuits from the oven and transfer them to a wire rack to cool completely before serving to your dog.