I believe its net, and i dont think it would have despawned... so maybe someone killed it. In any case try contacting someone who offered to refund you personally, then when its solved, ask a mod to close this thread
Occasionally Cypriot or Noobcrew will kill all the mobs on the server to reduce the lag issues, that's why there is a animal warp so you don't get to attached (correct me if I am wrong)
Mods can also reduce lag entities by radius around them, maybe one accidentally killed your sheep. You've had an offer for a personal refund. Locking and archiving. EDIT: UnHidden Content: AmazingGraceGirl Should I not lock it?