Slice the carrots into ¼-inch-thick rounds or strips using a sharp knife or mandolin.
Steam the carrots: Place a steamer rack in a large pot filled with 2 inches of water. Bring the water to a simmer, then add the carrots. Cover the pot and steam for 4 minutes, or until just tender but not falling apart. Remove the carrots when done and allow them to cool.
Combine the herbs in a small bowl, then sprinkle over the carrots.
Place the carrots evenly between the COSORI Food Dehydrator trays.
Set temperature to 135°F and time to 4 hours, then press Start/Stop.
Remove when done, cool to room temperature on the trays, then serve to your pet.