Which of the following sentences does not belong in this illustration paragraph?

Dogs have a strong sense of their pack, much stronger
than I ever realized. When our American Eskimo dog finds
us in two separate rooms, he has to pace back and forth
between the rooms until we both are finally back in the
same room. He does not take kindly to his pack being
separated. He is also a herder. Sometimes, he will simply
lie down in between the rooms so that he can keep his eye
on both of us. This is apparently not uncommon, as this
breed has an extremely strong sense of the pack.

A. He is also a herder.

B. This is apparently not uncommon, as this breed has an extremely
strong sense of the pack.

C. Sometimes, he will simply lie down in between the rooms so that
he can keep his eye on both of us.

D. Dogs have a strong sense of their pack, much stronger than I ever
realized