Indian practices, as you've put it, are carried out on reservations - property that was set-aside for the native American people as an area for the native Americans to govern and manage in accordance with their own cultural ideals and religious beliefs.
The urban areas of America's cities are not federally set aside areas for the inhabitants to govern as they see fit. They have to abide by the city, county, state and federal laws that have been passed in a democratic manner. Just because they don't agree with those laws, doesn't give them license to break them.
Forgetting for a moment that Michael Vick isn't a Native American, and that his dog fighting wasn't carried out on a reservation, or the inner city for that matter (his dog fighting took place on the property surrounding his suburban Virginia home), are you arguing that Vick's commercial dog fighting venture was somehow an expression of Vick's long-held religious views steeped in centuries of tradition?
Your argument is not very well grounded in neither history nor law.
I also saw dog fighting when I was in korea, well accepted too, course they ate dogs also.
I don't care where you find Indians, they practice their culture and don't give a hoot what the law says or what anybody thinks; you ain't gonna change them either. Guess that you've never been around Indians to know that though.
Just wait until the do gooders, touchy feely crowd decides something as American as Apple Pie is no longer acceptable in our modern society. You'll lose your freedom quick and then wonder how it happened. Animals were put on this earth for the use of man; not the otherway around.