Do you know how to tell a sheep's age ?" "No, uncle." "Here, open your mouth, Cosset," he said to the lamb that he still held.
"At one year they have two teeth in the centre of the jaw.

They get two teeth more every year up to five years.

Then we say they have 'a full mouth.' After that you can't tell their age exactly by the teeth.

Now, run back to your mother," and he let the lamb go.
"Do they always know their own mothers ?" asked Miss Laura.
"Usually.

Sometimes a ewe will not own her lamb.