Add blueberries to a blender or food processor and blend until completely smooth; strain through a fine mesh sieve if you prefer a smoother texture.

Transfer the blueberry puree to a small saucepan and add the coconut oil and optional honey.

Warm the mixture over low heat, stirring often, until the coconut oil is fully melted and the mixture is warm but not boiling.

Sprinkle the agar agar powder evenly over the warm mixture and let it sit undisturbed for 1 minute to bloom.

After blooming, whisk the mixture continuously over low heat for 2 to 3 minutes until the agar agar is fully dissolved and the liquid is smooth and slightly thickened.

Remove the saucepan from heat and carefully pour or spoon the mixture into silicone molds, filling each cavity almost to the top.

Gently tap the molds on the counter to release any air bubbles and smooth the tops.

Place the filled molds in the refrigerator and chill for 2 to 3 hours, or until the gummies are completely firm.

Once set, pop the gummies out of the molds and transfer them to an airtight container.

Serve 1 to 2 small gummies to your dog, depending on size, and store the remaining gummies in the refrigerator.