What is the second biggest wolf breed in world?

There isn't really a definitive answer to this question, as it depends on how you define "biggest" and "breed."

Here's why:

* "Breed" is typically used for domesticated dogs, not wolves. Wolves are wild animals and don't have distinct breeds like dogs do.

* Wolves vary in size based on location and subspecies. The largest wolves are usually found in areas like Alaska and Siberia, but there's no single "biggest" wolf breed.

However, you can consider some of the largest wolf subspecies:

* Eastern Siberian Wolf: This subspecies is known for its massive size, with males typically reaching 100-150 pounds.

* Alaskan Wolf: Similar in size to the Eastern Siberian Wolf, Alaskan wolves are also very large.

* Canadian Timber Wolf: This subspecies can also grow quite large, with males averaging around 100 pounds.

So, while there isn't a specific "second biggest wolf breed," the Eastern Siberian Wolf and Alaskan Wolf are both contenders for the title of largest wolf subspecies.