What is the binomial name for a Golden Retriever?

I am doing a project for school and I need to know the binomial name for a Golden Retriever, Dalmation, Chihuahua, and Bulldog. And I can't find it on Wikipedia or any other website? So if anybody knows anything, please share! Thanks (:

I think it's a trick question.

The binomial name refers to the genus+species of the organism. For all dogs and gray wolves this would be Canis lupus. The subspecies "dog" as opposed to "wolf" has a trinomial name of Canis lupus familiaris. There isn't further distinction for breeds of dogs.