Goats and Sheep:
*NEW* this year 2018: The official identification for all classes of goats and sheep is a Scrapie Tag. No EID tags or 4-H tags are required for sheep and goats.
Before you can get Scrapie Tags, you must have a premise ID number and a Flock ID number, which the Department of Agriculture can assign to you. Call them at 402-434-2300. As long as their funds last, you can get Scrapie Tags free from them. They also have a website you can visit at: http://www.nda.nebraska.gov/animal/diseases/scrapie/index.html
If you already have the needed ID numbers, you can order Scrapie Tags from a vendor of your choice. You can find a list of vendors, and more about Scrapies at: http://www.eradicatescrapie.org/
FYI: Dairy goats do not need a Scrapie Tag but must have a tattoo in the ear (or tail web for the LaMancha breed) which corresponds to a herd ID assigned by the USDA or is accompanied by a breed registration paper listing the current owner.