how about designing (I know that is cheating, but evolution would require it) a new species from the many breeds of dog. I've posted this before, something to think about:
Imagine an island with plenty of pasture, water, etc., but no animals. Introduce 100 male horses and 100 female donkeys. Come back in 100 years. There will be no equids.:
Now imagine an island with plenty of game, water, etc. Introduce 100 male great Danes and 100 female chihuahuas. Come back in 100 years. There will be no canids.
Conclusion. Great Danes and chihuahuas are different species.
>Now imagine an island with plenty of game, water, etc. Introduce 100 male great Danes and 100 female chihuahuas. Come back in 100 years. There will be no canids.
>Conclusion. Great Danes and chihuahuas are different species.
And by such reason if there were female great danes and male chihuahuas which produced viable offspring on another island, then your conclusion would be proved false.