Crossword Genius

Pet trained to look for its owner? (5,3)

Ross

I believe the answer is:

guide dog

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

'owner?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'pet trained to look for its' is the wordplay.
I cannot really understand how this works, but
'pet' could be 'dog' and 'dog' is found within the answer.
The remaining letters 'guide' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for guide dog that I've seen before include "Blind person's helper" , "Canine for the visually-impaired" , "blind leader" , "Aid for the visually impaired" , "Aid for blind person" .)

I've seen this clue in The Sun.
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