A.T. Robertson Commentary Luke 15:5

"And when he hath found it, he layeth it on his shoulders, rejoicing." — Luke 15:5 (ASV)

On his shoulders (επ τους ωμους αυτου). 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 (ωμος) is old and common, but in the N.T. only here and Mt 23:4.

Rejoicing (χαιρων). "There is no upbraiding of the wandering sheep, nor murmuring at the trouble" (Plummer).