Mad as a Hatter

In wikipedia, it says that the difference between the wolf and the dog is in the subspecies level:

Canis lupus has 39 subspecies currently described, including two subspecies of domestic dog, Canis lupus dingo and Canis lupus familiaris, and many subspecies of wolf throughout the Northern hemisphere. The nominate subspecies is Canis lupus lupus.

But I'm guessing these classifications are subject to change.

Thanks for the link! :)