What does 'whose' mean?

[Kaddy]

English Grammar Tests, Elementary Level

ESL/EFL Test #47 "Question Words", question 7

......... dog is that?

(a) Who
(b) When
(c) Whose
(d) Where

English Grammar Tests, Elementary Level

ESL/EFL Test #47 "Question Words", answer 7

Whose dog is that?

Correct answer: (c) Whose
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when I use this word whose?

Kaddy

[Torsten]

You use it to ask for the ownership of something. By the way, your question should read 'When do I use the word whose'?
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