ThatMutt.com has a nice post and discussion on the issue of "guardian" versus "owner".
I have different opinions than Lindsay does, and I offer them in the comment section. It is good to make informed decisions, and I think both sides are represented in the post and comments.
I also like this paper which delves into this very issue: http://sjalp.stanford.edu/pdfs/Hankin.pdf.
Share your thoughts here or over at Lindsay's article. Play nice and respectful-like. :)