just out of interest i just found this .. concept of hybrid vigor assumes that a crossbred animal (and this term is most often used in discussing dogs) will be healthier than a purebred. In reality, this is often false.
In order to be a hybrid, an animal must be the product of two different species: donkey and a horse, offspring is a mule; lion (m) and a tiger (f), offspring is a liger; tiger (m) and lion (f), offspring is a tigon; wolf and domestic dog, offspring is called a wolf hybrid. Remember high school Biology, animal classification: Kingdom, Phylum, Class, Order, Family, Genus, an