If you look at the American Bulldog you will see what Bulldogs in England used to look like. They were used for bull baiting, fighting bulls. This was eventually outlawed in England and in order to save the breed people started breeding pug into them. That is what shortened their faces. read more
Bulldogs actually do most of their sweating through the pads on their feet and accordingly enjoy cool floors. Like all brachycephalic, or"short faced", breeds, Bulldogs can easily become overheated and even die from hyperthermia. read more