Are pit bulls now acceptable in the publishing world

After The Dogs Who Found Me came out three years ago, I mentioned that I wanted to write a social history of the American Pit Bull. No one was interested. My book, with a pit bull on the cover, went on to sell over 50,000 copies and my publisher wanted another book. I suggested a social history of the American Pit Bull. They weren't interested. I met with another publisher, suggested an approach, almost agreed to compromise, and yet it was made clear that there was little support for the book, and I decided to wait til someone really understood what I wanted to do, and that there was an audience for it. A few months ago I started working on a new proposal on the same subject, and then, suddenly, pit bulls were on the cover of Sports Illustrated. Now comes the news that the Sports Illustrated author has signed a deal to write "The Lost Dogs"--an account of the the Vick dogs and their lives after being rescued.

Is there still room for another pit bull book on the shelf?