It was. As I indicated in Post #1, it is breeding within a species, which is "crossbreeding" by definition. Take it up with your dictionary, or with Wikipedia:
"A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction."Pretty obviously, crossing two different species cannot be done.
And if it IS successfully done, then that shows that they are NOT two different species, something that radical environmentalists who are in love with the "endangered species act" are reluctant to admit. Many "endangered species" are merely breeds of a species which is NOT endangered.
That said, there ARE cases of cross-breeding between species (eg, lions and tigers, and occasionally with horse/donkey mules) where viable offspring happen rarely, but do exist. This means that species boundaries can be fuzzy in cases.