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Dog, say, shakes with abdominal pain (12)

Ross

I believe the answer is:

collywobbles

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(Other definitions for collywobbles that I've seen before include "Intense anxiety" , "Owls by Belloc (anag) -- severe gastroenteritis" , "Feeling of apprehension" , "Nervous apprehension" , "Upset stomach" .)

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