Crossword Genius

Spooner’s dog tail so long? (6-3)

Ross

I believe the answer is:

toodle-pip

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'so long?' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for toodle-pip that I've seen before include "so long" , "Farewell (informal)" , "Goodbye (dated)" , "Farewell remark - dipole top (anag)" , "Take care" .)

I've seen this clue in the Sydney Morning Herald.
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