Hybrid vigor
That was the term used in genetics class to express why hybrid breeds are usually stronger than pure breeds. In the case of dogs that you mentioned, several "pure" breeds are so inbred that they have genetic defects.
Off Topic » in reply to "the European gene pool"?
That was the term used in genetics class to express why hybrid breeds are usually stronger than pure breeds. In the case of dogs that you mentioned, several "pure" breeds are so inbred that they have genetic defects.