I had to put my almost a year old pygmy goat down. His name was Gus, named after my grandfather. He was a little sweetheart! I don't know what was wrong with him except he was in a lot of pain, probably an intestinal thing going on. There are no vets in our area that know anything about goats and I don't think he would have made the 2 hour drive to the university where they DO know about goats.
Goats are very picky about what they eat and sometimes are very sensitive to different foods. They have delicate digestive systems.
I know it sounds weird to grieve over a goat, but until you own a goat it's difficult to understand how really cool and smart they are!