We took Gracie, Joey, Tuxie, and our new colt Cisco to the vet to get their shots and coggins testing done. Our vet does an annual clinic for the horses. We get to take them in and they get their 5-way, West Nile, Worming, and Coggins test done at a much more resonable price than it would be if we had all it done separately.
Its good to keep your Coggins updated so that at a moments notice you are off on the trail. Check with your state to see if you need to have your Coggins done every 6 months or just once a year. We found a cool document that states all of the necessary documents you need in each state to travel with your horse. Here is a link to that Transportation Requirements by State
We also found this informational article from Trail Rider Magazine called Equine Traveling Papers that is full of information on the different documents needed for transportation of your horse and how to obtain them.