Poor dog's portion (4)

I think it could be either:

Which length description are you looking for?:

3-1

none

'poor dog's portion' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for none that I've seen before include "What's left after taking all" , "service for monks" , "Not a soul" , "Nobody - nothing" , "Not a single person" .)

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