Remove the rind completely and cut watermelon into bite-sized cubes appropriate for your dog's size. Small dogs need pieces no larger than a grape, while large breeds can handle chunks up to an inch. Meticulously remove all black seeds and white seed remnants.

For simple cubes, place watermelon pieces directly on a parchment-lined baking sheet, ensuring they don't touch. For pureed treats, blend watermelon until smooth, then pour into ice cube trays or silicone molds.

Place the tray in your freezer for 2-3 hours until the watermelon pieces are partially frozen but still slightly soft.

Once individually frozen, transfer the treats to freezer-safe containers or bags. Label with the date and return to freezer for final hardening for 4-6 hours total freezing time.

Remove treats from freezer 2-3 minutes before serving to prevent brain freeze and make chewing easier.