Question

Did you see a dog change it's voice​

Answer 1

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$\huge\purple{\underline{\mathfrak{Required\:Answer\:↴}}}$

Was a dog seen by you ?

Explanation ↴

If any Interrogative Sentence starts from do, does or did then while preparing Passive Voice, we should use am/is/are/was and were according to the Number & Person of Object.

Active: Did you see the bird ?

Passive: Was the bird seen by you ?

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Answer 2

Answer:

Was the dog seen by you?

Explanation:

hope it's help you