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Major spoiler for the book, but he is called Sharkey at the end in the scouring of the Shire.
The shire horse is named a shire horse because it originated in the shire counties of England.
Scouring Powder is an abrasive substance used in cleaning.
A scouring pad is a pad used to scour something
I can see that I'm going to need another scouring pad.
We're scouring the woods for the child with all available resources.