What is the most popular breed of wolves?

There is no such thing as a "breed" of wolves. The term "breed" is typically used for domesticated animals, like dogs. Wolves are wild animals and do not have breeds in the same way that dogs do.

However, there are different subspecies of wolves, such as:

* Gray wolf (Canis lupus): This is the most common and widely distributed wolf subspecies.

* Red wolf (Canis lupus rufus): This subspecies is critically endangered and found only in the southeastern United States.

* Eastern wolf (Canis lupus lycaon): This subspecies is found in the northeastern United States and eastern Canada.

* Arctic wolf (Canis lupus arctos): This subspecies is found in the Arctic regions of Canada, Greenland, Russia, and Scandinavia.

* Indian wolf (Canis lupus pallipes): This subspecies is found in the Indian subcontinent.

It's important to note that these are just some of the recognized subspecies, and there is ongoing scientific debate about their classification.