they're not some other species though? they're still just normal old domesticated dogs. dogs are bred to have favorable genetics for a certain task but that doesn't mean they somehow inherit learned personalities/behaviors
Different dog breeds are bred to be you know, different
Retrievers are a breed which through generations, bred for retrieving (when they were work dogs), same for herding dogs, hunting dogs, pointers
Same thing with pitbulls, they were bred for the work of bull-baiting and fighting, which is why they tend to not show signs before attacking and tend to "snap", even when loving owners take care of them for years.