I don’t need an auxiliary verb and I’m not going to use it. Adding an auxiliary verb is important. Why are some people putting off attending classes but when will they actually be? Explain the question before heading with the question and choose subject auxiliary inversion rather than inversion, simply changing Subject. That allows for a correct structure.

Interestingly, the word whose is not the subject here, but a Determiner within the noun phrase whose dogs. When the Subject is the “Part of the Subject” the real rule is that if it is subject part- or post- subject, you don’t need to use subject auxiliary inversion, and don’t need to have an auxiliary. In the Poster’s examples, the word whose is part of the Subject Noun phrase Whose dog? If I wrote auxiliary DO files then I don’t need to use

it.