Because animals are property, we consider as "humane treatment" that we would regard as torture if it were inflicted on humans.
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Michael Vick may enjoy watching dogs fight. Someone else may find that repulsive but see nothing wrong with eating an animal who has had a life as full of pain and suffering as the lives of the fighting dogs. It's strange that we regard the latter as morally different from, and superior to, the former.
There is increasing social concern about our use of nonhumans for experiments, food, clothing and entertainment. This concern about animals reflects both our own moral development as a civilization and our recognition that the differences between humans and animals are, for the most part, differences of degree and not of kind.