Traces dogs' companions (7)
I believe the answer is:
shadows
This clue could be a double definition.
'traces' is the first definition.
('shadow' can be a synonym of 'trace')
'dogs' companions' is the second definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps there's an association between them I don't understand?
Can you help me to learn more?
(Other definitions for shadows that I've seen before include "They're cast by blocking the sun" , "tracks" , "Dogs" , "1960s band" , "Dark areas where the light is blocked" .)