Coggins papers are documents that you get from your vet after they test for Coggins (they draw some blood, send it to the lab, etc). They will either come out positive or negative. If they come out positive, they will be basically barred from any place that allows any horses to come in! (trail rides, shows, auctions, crossing state lines, etc) as it is a highly contagious disease. Fortunately I I believe it's pretty rare, but almost all places (esp shows) will ask for one. So you just need to prove that they're negative and bring your papers with you. (some shows will ask you to mail in a copy with your entries, some shows will ask to see it when you check in, some shows will require one but never ask about it :) ) This SHOULD be taken annually with your shots. I'd ask your vet and get one drawn if you haven't already. Almost all places will require a negative coggins. And depending on the lab it just takes a day or two and costs about $25.