Not just any generic "Sword of Shearing +1". Sheep-biter can be recognized by its ram-horn hilt and pommel, and by the engraving along blade, which reads (for those who know the script) "QUIS CUSTODIET IPSOS OVES"
Cortana, Excalibur, Durandal and Gram make fun of Sheep-Biter, but that's just because they're jealous.
The wielder of Sheep-biter has double HP for purposes of their resistance to the Sleep spell. Wake up, sheeple!
Don't forget the engraved image of a naked, shivering sheep on the handguard.