hi, this is a problem that does happen in the boston terrier. when i went looking for a puppy i asked what hte hereditory problems of the breed were. the pinched nostil was one of them. the breeder advised me to look at hte pup if the nostrils were pinched before purchasing. my boston doesn't have it but i know one that had beed operated on. your pup may not have any problems yet but it can cause serious problems. fainting, suffication are possiblities. stress and excersise may cause problems on later days. when tempurtures rise the breathing may become stressfull. an oxigen difficioncy is a possibility.
the dog that i know had no problems after the nose job. i'd advise operate. why risk the chance of complications?