The whole problem about this is that nothing can be proved, on either side. In the end there are only opinions, pro or con, based on whatever version of this event people decide to believe. We don't know for sure what really happened, only what Vargas says happened and not everyone buys it.

What they actually saw was a skeleton-thin dog tethered in a bare corner of a room (which wasn't done in Vargas' own country where they have anti-animal cruelty laws) about which Vargas said that it 'would have died in the streets anyway'. No one really knows for sure what went on between shows or afterwards, and that's the bit that's bothering people. The rest of the story hinges entirely on what we have been told, which means what we've read (You Are What You Read, remember). It's fair to call it into question.