同一个爹妈生的小柴犬，可胆量为啥差距这么大\The same parent of the puppies, the different personality

小柴犬第一次出门，一个胆子很大，一个胆子很小，我好奇为啥同一个爹妈生出了性格截然不同的宝宝\The first time the small puppies went out, one was brave and the other was very timid.I was curious about why the same parent gave birth to a different character baby