You would want pretty small tags for goats. They're usually 2-piece with one piece pointed to pierce thru the thin-cartilage part of the ear, avoiding obvious veins, the pointy piece locking into the numbered plastic tag. There's a special plier-type device just for these, most of the time, they don't even flinch. I use these all the time to make record-keeping easier on my feeder steers. There is no actual requirement here in the US.

You would want pretty small tags for goats. They're usually 2-piece with one piece pointed to pierce thru the thin-cartilage part of the ear, avoiding obvious veins, the pointy piece locking into the numbered plastic tag. There's a special plier-type device just for these. I use these all the time to make record-keeping easier on my feeder steers. There is no actual requirement here in the US.