A particularly sick quote from that site:
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Do you really force old dogs to fight?
No dog is ever “forced” to do anything. We do offer a “golden years” division in which coaches are allowed to enter an assortment of athletes in the waning days of their lives. The cost of putting an animal down can be a burden on some families, so we offer an easy, cost-free way to put animals to sleep in the most natural environment possible; the death match. Losing animals are put forever to rest, usually within mere minutes, and winners are put down usually within three to five matches, though they could technically prove you wrong about how much spring is left in their step. We witnessed a Retriever/Labrador go through seven rounds in Tampa last year before finally succumbing to the blood loss. For many, these last hours of life will be the hallmark by which their beloved pet is forever remembered.