What taxonomy do the gray wolf and a common dog not have in common?

The gray wolf (Canis lupus) and the common dog (Canis lupus familiaris) actually share the same species classification. This means they are considered the same species, Canis lupus.

The difference lies in their subspecies classification:

* Gray wolf: Canis lupus lupus

* Common dog: Canis lupus familiaris

This means that dogs are actually a domesticated subspecies of gray wolves. They are genetically very similar and can even interbreed.

So, the gray wolf and a common dog share all taxonomic classifications except for their subspecies designation.