Have a look at Ilana Mercer's Barely A Blog.
Are animals, as libertarian thinking tells us, limited to their position as chattel under all circumstances? Is a case of dog fighting just "in the tut-tut class" or do we have a responsibility towards creation and can be hold accountable for how we treat our living, breathing, feeling chattel?
This topic is particularly interesting because conflicting values, such as property rights and responsibility for a fellow creature meet head-on here, something for which libertarian thinking has no answer. At least so I think.
There is an interesting discussion going on and some excellent points made from all sides of this many-faceted issue.