Sentence:  The process is quite simple: with the sheep firmly planted in the boots, the shepherd — let's call him Rumplestiltskin for arguement's sake — sneaks up behind the sheep (or the singular <WSD>shoop</WSD>) and inserts his feet in the boots behind the <WSD>shoop</WSD>. 
Meaning of the word marked with <WSD> tags:  A sheep; "specifically singular form of '''sheep'''''.