Crossword Genius

Animal trained to work without worrying (8)

Ross

I believe the answer is:

sheepdog

I'm a little stuck... Click here to teach me more about this clue!

'animal trained to work without worrying' is the definition.
I can't judge whether this defines the answer.

'animal trained to work' is the wordplay.
'animal' becomes 'sheep' (I have seen 'Woolly animal ' mean 'sheep' so perhaps 'animal' could also mean 'sheep').
'trained to work' becomes 'dog' (I can't justify this - if you can you should believe this answer much more).
'sheep'+'dog'='SHEEPDOG'

Can you help me to learn more?

(Other definitions for sheepdog that I've seen before include "could it be Old English?" , "Pastoral assistant?" , "eg Border collie" , "One drives over fields" , "Canine trained to control flock" .)

I've seen this clue in The Globe and Mail.
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