Here is an article in Forbes which details some of the things they found on Michael Vick's property. From the article.
Fifty-four animals were recovered from the property during searches in April, along with a "rape stand," used to hold dogs in place for mating; an electric treadmill modified for dogs; and a bloodied piece of carpeting, the documents said.
Fights would end when one dog died or with the surrender of the losing dog, which was sometimes put to death by drowning, strangulation, hanging, gun shot, electrocution or some other method, according to the documents.
I'm just glad he had absolutely no idea what was happening on his own property, as I'm sure he would have been very upset. Did I mention he used to breed dogs that happen to be some of the very same type of dogs used in dogfighting? Talk about crazy coincidences. His website is down, but here is one with a site with a quote from his site.