I think maybe you should look into the Bulldogs that were produced by David Leavitt, if you are interested in the Dorset Bulldogge, especially with you being in the US. He has produced some fine Bulldogs over the years that are just as nice, if not better than the Dorset Bulldog (which are also very nice by the way). I'm fairly biased as I love some of the dogs that have been produced by David Leavitt, fine looking Bulldogges!

I have no idea if there is a breeding programme for Dorsets in the US but I am sure if you were to contact a man called Steve Barnett, who is the founder of the Dorset he would beable to tell you.
If you would like to PM me I have his contact details