I owned Bulldogs for years before falling in love with the Olde English (which really are not that much different to be honest) although my dogs dont tend to suffer that much in the heat.
They can be very prone to allergies in the hot weather, so make sure you keep some Piriton to hand, make sure the face is bathed daily I used to use Savlon on my Bullies faces to stop build up of germs and to keep infection at bay, also bottoms need to be wiped daily after doing poo`s to stop infection getting underneath the tail area, as this can very quickly become ulcerated if not wiped..housetraining can be hard with Bulldogs because of their stubborn natures I had one that was not fully housetrained at 10 months old
But you can`t help but love them
Good luck with your pup