Who gets the first whiff of dogs’ droppings?

From the text:

"Wait!"shrieked one of the witches in the back row."Hold everything!" Her shrieking voice echoed through the Ballroom, like a trumpet. All the witches suddenly stopped and turned and looked towards the speaker. She was one of the taller witches and I could see her standing there with her head tilted back and her nose in the air and she was sucking in great long breaths of air through those curvy pink sea-shelly nostrils of hers.
"Wait!"she shouted again.
"What is it?" the others cried out.
"Dogs' droppings!" she yelled. "Just then I got a whiff of dogs' droppings!