Hmm, Bull Dogs fart ALL the time, snore, have many health issues and have a relatively short life expectancy. They also do not tolerate heat very well. Other than that they are great dogs.
http://en.wikipedia.org/wiki/Bulldog



Now American Bull Dogs are a different story. http://en.wikipedia.org/wiki/American_Bulldog

Big, friendly dogs that are very intimidating looking.

This is just my experience with the two breeds and remember, I'm really a cat person.