Since Operation Dog Catcher’s start at JFK, seven illegally imported underage puppies arrived dead in the United States. At higher risks for death are the popular French and English bulldogs (both brachycephalic breeds—their smooshed noses make it harder to breathe normally)

https://www.cdc.gov/importation/bringing-an-animal-into-the-united-states/operation-dog-catcher.html#:~:text=Since%20Operation%20Dog%20Catcher’s%20start,it%20harder%20to%20breathe%20normally).