Sorry to hear about your goat. Its always rough to lose an animal no matter how many you have. I would have a vet do a post on the animal that died. He/she will be able to give you a cause of death. This may help you determine if the rest of your animals are at risk and may give you some preventative treatment options to reduce their risk of sickness. You have experienced the greatest risk of buying an animal at an auction or from a questionable seller...Buying a sick or unsound animal and it dying or passing some sickness on to the rest of your goats...I, personally, would never buy an animal at an auction...I have been tempted many times but the risk is too great.....Also remember any advice you get here or anywhere is based on the authors experiences, right or wrong....Your vet should be your first call at any sign of problems....I've seen alot of websites listed above but no one has listed the sister site: http://www.backyardherds.com/forum/index.php There are many very "wise" people that contribute there.