You may need to add some additional flour depending on the size of your avocado, so keep some extra on hand.
Preheat oven to 180ºC
Turn out onto a surface lined with baking paper and roll to an even 0.5cm (1/4 inch) thickness.
Cut out and place on a baking tray lined with grease-proof paper.
Bake for 20-25 minutes or until just browned around the edges.
You can turn off the oven and leave the biscuits inside to cool slowly, creating a crunchier dog treat.