On his shoulders (epi tous ōmous autou). He does it himself in exuberant affection and of necessity as the poor lost sheep is helpless. Note the plural shoulders showing that the sheep was just back of the shepherd’s neck and drawn around by both hands. The word for shoulder (ōmos) is old and common, but in the N.T. only here and Mat 23:4.
Rejoicing (chairōn). “There is no upbraiding of the wandering sheep, nor murmuring at the trouble” (Plummer).