Is there any artificial species (in particular, an artificial species of animal)? Dogs were artificially selected from wolves, but a dog and a wolf can produce fertile offspring, and thus are of the same species. I had heard that the aurochs and cattle were different species, but I could not find this information anywhere. I had heard also that some artificially selected flies are considered to be a new species. Is there any human-made species (especially a species of animal) which is not able to produce fertile offspring witch any other species, in particular with the one from which it evolved? **EDIT:** (A similar question in different words.) Is there any human-made animal lineage which was conceived by artificial selection and which is broadly accepted as not being a race or subspecies, but a species on its own.

**Artificial selection leading to new species - Domestication**

As you talk about dogs in your intro, let's consider them.

You will fail to breed a great dane and chihuahua for obvious mechanical reasons. You will also fail to breed a chihuahua with a wolf. So, yes artificial selection have lead to reproductive isolation.

**Artificial selection leading to new species - lab experiment**

Artificial selection have also lead to reproductive isolation in non-domesticated species. See for example the post Have we ever observed two drosophila lineages that evolved reproductive isolation in labs?

**Concept of species**

As a side note... Above, I consider the so-called 'biological species concept'. For a discussion on the definition of species, please have a look at this post.