Every sheep has it's own individual number to identify it. One of the numbers is my unique flock number, the other is the sheep's number within the flock. These numbers are recorded on ear tags which need to be applied by the time they are 9 months old. One tag (the yellow one) is an electronic tag, and goes in the sheeps left ear. They are applied with pliers, a third of the way along the ear (from the head) and between the two ridges of cartilage.
At the same time I have had a look at their feet and trimmed off any excess hoof. Sheep have cloven hooves that grow continuously, this growth is usually worn down but if it becomes overgrown bacteria can multiply in the foot and cause diseases such as foot rot and scald. To stop this happening, I check and cut back the hooves twice a year.