Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Minecraft summon sheep command
Using the summon command to spawn in a minecraft sheep is simple, take the command and enter into chat and presto you have a sheep. These woolly animals have data tags to do with color and shearing.
How to summon a sheared sheep or summon a shorn sheep.
English is a weird language both sheared sheep and shorn sheep are correct, but if you want to summon than it's Sheared
/summon minecraft:sheep ~ ~ ~ {Sheared:1}How to summon a baby sheep (lamb)
Like most passive mobs in Minecraft, you can summon a lamb by setting the Age tag to a negative number (under the "Additional" tab).
/summon minecraft:sheep ~ ~ ~ {Age:-1200} (Grows up in 60 seconds)/summon minecraft:sheep ~ ~ ~ {Age:-6000} (Grows up in 5 minutes)
How to summon a different colored sheep.
Sheep use the common Color tag to set the wool color. When sheared they will drop that color wool and regrow.
Summon Orange Sheep
/summon minecraft:sheep ~ ~ ~ {Color:1}
Summon Magenta Sheep
/summon minecraft:sheep ~ ~ ~ {Color:2}
Summon Light Blue Sheep
/summon minecraft:sheep ~ ~ ~ {Color:3}
Summon Yellow Sheep
/summon minecraft:sheep ~ ~ ~ {Color:4}
Summon Lime Sheep
/summon minecraft:sheep ~ ~ ~ {Color:5}
Summon Pink Sheep
/summon minecraft:sheep ~ ~ ~ {Color:6}
Summon Gray Sheep
/summon minecraft:sheep ~ ~ ~ {Color:7}
Summon Light Gray Sheep
/summon minecraft:sheep ~ ~ ~ {Color:8}
Summon Cyan Sheep
/summon minecraft:sheep ~ ~ ~ {Color:9}
Summon Purple Sheep
/summon minecraft:sheep ~ ~ ~ {Color:10}
Summon Blue Sheep
/summon minecraft:sheep ~ ~ ~ {Color:11}
Summon Brown Sheep
/summon minecraft:sheep ~ ~ ~ {Color:12}
Summon Green Sheep
/summon minecraft:sheep ~ ~ ~ {Color:13}
Summon Red Sheep
/summon minecraft:sheep ~ ~ ~ {Color:14}
Summon Black Sheep
/summon minecraft:sheep ~ ~ ~ {Color:15}
Suggestions or found a bug
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If you're looking for a particular summon mob generator you can link to these specific versions of the command generator.