Bostons, along with the Pug, Shih Tzu and other short-faced breeds are brachycephalic breeds. The word comes from the Greek root "brachy" meaning short and "cephalic." This anatomy can cause tiny nostrils, long buildings and narrow trachea. For this reason, Bostons may be subject to resonate and reverse sneezing repeatedly and forced a rapid inhalation through the nose, accompanied by nausea inhalation or sounds used to prepare the taste of the mucus, but does not harm the dog in any way.
Bostons often require a cesarean delivery, with over 90% of the litters in a survey in the UK Kennel Club delivered this way.