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Used to have animals outside - dogs? (7)

Ross

I believe the answer is:

shadows

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'dogs?' is the definition.
(dog can mean to follow or shadow)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for shadows that I've seen before include "1960s band" , "They're cast by blocking the sun" , "Dark areas where the light is blocked" , "Dogs" , "Follows" .)

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