Don't know for sure, but I think it's probably more of an individual thing. We have a couple of dogs that swell up like a balloon from a hornet sting, and some who don't react at all. They're all the same breed.
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."