Two animals working together will gather ruminants (8)

I believe the answer is:

sheepdog

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'working together will gather ruminants' is the definition.
I can't judge whether this defines the answer.

'two animals' is the wordplay.
'two animals' can mean two replacements for 'animal'.
'animal' becomes 'sheep' (I have seen 'Woolly animal ' mean 'sheep' so perhaps 'animal' could also mean 'sheep').
'animal' becomes 'dog' (type of animal).
'sheep'+'dog'='SHEEPDOG'

Can you help me to learn more?

(Other definitions for sheepdog that I've seen before include "eg Border collie" , "One drives over fields" , "Farmer's herding helper" , "Collie, for example" , "Pastoral assistant?" .)

I've seen this clue in The Irish Times.

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