I have heard rumours of a 15" Jack Dempsey at a university in Ontario Canada...Guelph maybe? Have yet to see the pictures though.
The pic below isn't the largest con I have ever seen, but it is certainly the most obese! It belongs to a friend of mine. It's like he has a thyroid problem. His weight fluctuates quite a bit. This isn't the chunkiest I have seen him, but it's the chunkiest picture I have of him.