What is the genus name for the common dog?

Canis familiaris

The Wikipedia webpage for "dog" lists it as "Canis lupus familiaris;" i.e. "lupus" is the species, making "familiaris" a sub-species categorization. See that webpage for explanation. It also says that "Canis familiaris" is a reasonable synonym, but the point is that all dogs are said to be descended directly from the gray wolf.