Regarding animals and spent grain,
it's common practice for breweries to give their grains to local farmers to feed to livestock. In the brewing process, it is almost impossible to get all of the nutrients out of the grains and into the wort (80% efficiency is good). What is left over is a mildly sweet and nutrient rich mixture that can be eaten or used as fertilizer if tilled into soil. A great example, we visited the Ommegang Brewery over the holidays. They painted their spent grain silo like a cow so the farmers know exactly where to go to pick up their bounty. Some brewpubs feature meat from those very same farms completing the cycle. We'll get there someday. For now, you get 'artisan' dog food. Let us know if the recipients have any valuable feedback.