Does "whose" correlate with a noun or a possesive determiner? For example:
"Whose dog is that?" "That's Johnny's dog."
This would imply that "whose" correlates with "Johnny's" or that "whose dog" correlates with "Johnny's dog". This makes intuitive sense, as they serve the same syntactical function. Yet, the following noun phrase can be made:
"Johnny, whose dog was hungry."
If this is grammatically correct, it would imply that "whose" correlates with a noun. It would thus seem that this construction is incorrect, yet it has become so generally accepted that no one bats an eye.