I also wondered if it throwing up is common in Bostons.
I have a 16 month old boston and he has always had problems with throwing up. There was a point, when he was alot younger, where he would throw up 5 times a day!!! Everything else was fine with him, he was even still super hyper and playful. Needless to say I panicked and rushed to the vet. Turns out he is fine he just has a very sensitive stomach. They put him on Medi-cal Gastro wet food which has worked WONDERS for him (he used to eat Eukenuba dry puppy food). Now, I know he has a sensitive stomach and it has become a game of "test the food". If he throws up, now I know it is because he ate something that has not agreed with him. Things that I have found to be really bad for his stomach is
anything he eats outside
dry dog food
Tomato based foods

He still has alot of gas though. The vet says this is not a problem though.