Thank you, Rbit! I hadn't thought of that!
Up until now I have been using the normal toilet, which means my cow patties have been going into the septic or into the sewer. The first means a lot of nutrients are thrown away. The latter is NOT CARBON NEUTRAL - and I expect will be outlawed shortly, because of the Nitrous Oxide, C02, etc.
So I have decided to start collecting cow droppings in buckets, so they can be flattened, dried out, and later used for fuel, as you suggested! I am also going to train the dog.