Discussion
Before the time of Abraham at least five breeds of sheep had already been developed in Mesopotamia. From mummified remains (that is, preserved dead bodies) and ancient art it is also known that at least two different breeds had reached Egypt by about 2000 B.C. Thus it is likely that the sheep mentioned in the Bible were of more than one breed.
The Hebrew word kar seems to be used of imported foreign sheep and may refer to a special breed but some scholars think it refers to a wether (castrated ram), since this word is never used in the context of sacrifice. This word is also used for a battering ram, that is, a heavy pole suspended on a rope, used in war for breaking down walls. ’Ayil is the word for a ram or adult male sheep, rachel is a breeding ewe or female sheep, and taleh is a very young lamb, probably still unweaned. The remaining Hebrew words refer to sheep in general.
The Greek word probaton is the general word for sheep, or flocks that may include goats. Krios is the Greek word for a ram or male sheep. Pascha is a technical name for the Passover lamb exclusively, and the remaining Greek words all mean lamb. Ovis is the Latin word for sheep.
The early Hebrews were nomadic shepherds to whom sheep were the most important domestic animal. While goats eat almost any vegetation, sheep are much more selective about the grasses and plants they eat. This meant that suitable grazing for them was not always easy to find, and shepherds had to keep moving their flocks from place to place. This led to a nomadic lifestyle, with movable tents rather than houses being the normal household shelter. It was not until the occupation of Canaan after the Exodus that the lifestyle of the Israelites changed, and they became settled village-dwelling farmers and fruit growers.
However, even then, most households owned sheep, and some family members would function as shepherds, often living away from home for fairly long periods.
Sheep in the Bible were a source of meat, milk, wool, hides, and horns, and it seems likely that various strains were bred selectively to enhance production of these commodities. Wool is mentioned in the Bible as early as the Mosaic Law, which forbade the weaving of cloth containing both wool and plant fibers. The shearing of sheep is mentioned even earlier, in GEN 31:19. Wool was in fact the most common and available fiber known to the people of Israel.
There was a very extensive wool trade in biblical times, stretching from Egypt to China. In the Middle East wool was cheaper than cotton or linen, which were the other common fibers. (Silk was known by the time of Solomon, but it was extremely expensive as it was produced in China and handled by numerous traders on its way west.) It would be a mistake to think of all wool at that time as being white, as GEN 30:0 indicates quite clearly that there were also dark colored sheep and sheep that had dark and light patches, probably varying combinations of black, white, and brown.
We can be fairly sure that one breed of sheep known to the Israelites was the Fat-tailed Sheep Ovis laticaudata and that its fatty tail is referred to in EXO 29:22; LEV 3:9; LEV 8:25; LEV 9:19.
Rams’ horns had a variety of uses. Whole ram horns were used as drinking vessels, jars, and trumpets. But pieces of horn were used as handles for knives and other household implements, and for jewelry such as bracelets and beads. Needles too, and probably also arrow heads, were made from horn, as well as from bone and later from bronze and iron.
Sheep were also very important in Israelite religion. They were a very important element in the sacrificial system and in the traditional religious feasts, especially the Feast of Passover.
Description
Sheep and goats belong to the same general family. They differ in that sheep produce wool, which is a special type of soft hair, among the ordinary hairs on their bodies. A ram’s horns too differ in shape from a goat’s horns, those of a ram curling down in a tight spiral beside its face, with those of a goat curving more gently back towards its shoulders. The sheep of biblical times produced much shorter wool than is common with wool-bearing breeds of today.
The fat-tailed or broad-tailed sheep is a smallish breed usually brown and white with a very broad tail. Like most other breeds of sheep in the Middle East it has large floppy ears.
Sheep are generally fairly timid animals, lacking the self-confidence and adaptability of goats. While goats will spread out in their search for food and then regroup without much difficulty, sheep become very insecure when they are separated from other sheep and tend to stay bunched together. They thus require a lot of shepherding. In the Middle East the method of shepherding involves training the dominant ram to follow the shepherd. The remaining sheep then follow this dominant ram, which often wears a wooden clapper or a bell. As they feed, the sheep usually keep within earshot of this sound. It is likely that this method is centuries old. (For further comparison of sheep and goats, see Goat.)

Special significance or symbolism
Of all animals the sheep was the most important for the Israelite nation. It had great religious, social, and economic importance.
In the Bible sheep are a common metaphor for the people of Israel and perhaps for people in general. Like sheep the people are seen as easily going astray (PSA 119:176; ISA 53:6; JER 50:6; 1PE 2:25), as being in need of guidance and protection (1KI 22:17; 2CH 18:16; MAT 9:36; MRK 6:34), as being very defenseless (ISA 52:7), and as being destined to an early death (PSA 44:22; JER 12:3; ROM 8:36).

In the gospels Jesus also refers to his disciples as “sheep” and “lambs” (MAT 10:17; JHN 10:1; JHN 21:15; JHN 21:17; JHN 21:18).
The metaphor of the shepherd is extended to God himself who is the ultimate “Shepherd of Israel” (PSA 23:1; PSA 80:1). Then those who are responsible for the nurture, guidance, ruling, and protection of Israel, be it kings, prophets, or priests, are also likened to shepherds (ISA 56:11; JER 23:4; JER 49:19; EZK 34:2; ZEC 10:2).
The Messiah is also called a shepherd (ISA 40:11), and Jesus refers to himself as “the good shepherd” (JHN 10:11). In HEB 13:20 he is referred to as “the great shepherd of the sheep” and in 1PE 2:25 he is called “the Shepherd and Guardian of your lives".
Translation
In languages that have a word for sheep, it is advisable to translate according to the meanings given under Discussion above. If possible, the feminine forms should be translated as “female lamb” or “female sheep". In languages in which sheep are not known, a word has usually been coined or borrowed by the time Bible translation begins, and this word should be used. It is not advisable to substitute another locally well-known animal in this case, since doing so negates the ritual and symbolic importance that sheep had for the biblical cultures.
In translating PSA 23:1 it is extremely important to make sure that the phrase “my shepherd” preserves the relationship intended by the writer and reflects the psalmist’s theme that Yahweh is his benefactor, protector, and guide. There are really two metaphors involved in the opening verse-the caring shepherd (God) and by clear implication, the dependent sheep (the psalmist). In many languages the literal phrase “my shepherd” depicts a wrong relationship, meaning something like “the one who looks after my sheep” or “the one I employ to watch my sheep.” In many African languages unwary translators have produced a rendering that means “The Chief is (nothing more than) my herdsman.” It is often necessary to restructure the whole verse as something like “I am a sheep, and the lord is my shepherd."