A lamb cuts eight baby teeth in its lower jaw. Most don't get adult teeth until they are a year old, so a lamb is also a sheep less than a year old. The market likes 'prime lamb'.

A two-tooth hogget has two adult teeth and is over a year old. The cook often prefers two-tooth hogget, because it has more taste.

An older hogget has four adult teeth. After it cuts more adult teeth, it's just a ewe, wether or ram.

The teeth of older sheep can get worn down or break, and then they are 'broken mouthed'. All sheep have no teeth in their top jaw, just a bony plate. The teeth and plate should meet, so that the sheep can graze efficiently.

A ewe is a female sheep, the 'dam' of its lambs. They squat to urinate from the back end. Ewes have an udder that swells up just before they lamb. The udder has two teats, like a goat, but the shape makes them much harder to milk than a goat.

A ram is a male sheep, the 'sire' of its lambs. It has huge testes (usually just called balls), and its penis (pizzle) is in the middle of its belly line. A ram can service at least fifty ewes, so its genes are 'half the herd' and it needs to be good. Ram lambs are fertile from about six months old, and are quite happy to impregnate their mothers if you don't separate them. Rams fight other rams to work out the pecking order. They are dangerous if they charge at you or your family. Ram lambs should not be bottle-fed long term, or kept as pets - rams are safer if they remain a little afraid of humans.

A wether is a male sheep which has been castrated (nutted) - pizzle in the same place, but no balls. Ram lambs not needed for breeding are castrated. Wethers are often run for wool, but cleanskin wethers are just lawnmowers or prime meat lambs.

Cleanskin tails with no wool are less likely to collect dung and maggots, so you can leave tails on if you prefer. Most small farmers who tail their lambs (ie remove the tail) use special elastic bands called elastrator rings. Current advice is to leave enough tail to cover the bare skin around the sheep's anus.

Scurs are part-horns that develop on rams with one horn gene and one poll gene. Scurs can vary from very short to long. They can grow in odd directions, so you may need to trim them.

Black feet or white feet - it varies. Many farmers prefer black feet, which they say are harder, so the sheep is less likely to develop foot problems. The two 'toenails' usually need 'hoof trimming' from time to time.

Yards are needed to hold sheep for inspection, treatment or loading up for transport. The Internet provides many designs and manufacturers. With only two or three sheep, you can manage (just) by pushing a sheep against a fence or shed wall, and securing it with a gate/ panel or human muscle.