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Well done, now you've become my dog,

So pay my dollar, go whole hog,

A scratch or little mark, a splotch,

Yet best of all if with my notch

So off the part that can't think deeply, tread

Still in the head.

'I would never become a dog! Foul beasts.'
'In all our days we are all at some points dogs, no doubt.'
'How absurd. I surely will never be.'

Riddle Answer Top

Riddle Explanation
well done, now you've become my dog - to be top dog.

so pay my dollar, go whole hog - to be top dollar.

a scratch or little mark, a splotch,

Yet best of all if with my notch - top-notch.

so off the part that can't think deeply, tread still in the head - off the top of one's head.