I'll stick up for the sheep! They are not so dumb,but it depends what nationality they are.
Our mountain sheep which roam the hills and come down into the villages, are prevented by cattle grids in the
roads entering into the valley towns. But said animal has thought it out, and lies down and rolls over the grid(the more adventurous ones).
But holidaying on the Isle of Lewis,Scotland this year,proved to me the truth in John 10. The chalet we had was next to our host's bungalow, and
his backdoor opened out onto the hills. "Watch this",he said. His sheep were feeding with other sheep from the village,and when he called in Gaelic a word which means "little sheep" (more of a sound than a word),his sheep came running and the others lifted not their heads but kept munching grass.
"My sheep hear my voice and follow me."etc----I tried next day,and nothing happened! They would not listen to the voice of a stranger.
You could show a photo of a sheep,a lamb,and a flock to distinguish them. They are fitting examples of humans for their tendency to stray,
"all we like sheep have gone astray," but also their recognition of the Shepherd. The flock has also the distinctive marking that the shepherd places on them,
so that he knows them."I know my sheep,and am known of mine."
As for the smell, I am reminded of this. Those who aspire to the ministry and complain about people should understand that if you don't like the smell of the sheep, you shouldn't be a shepherd.