Dominic wasn't surprised by his wolf's jealous reaction to the sight of the fading bite from Mark's wolf teeth on Natalie's flesh. What surprised him was the fact that she had accommodated his wolf's basic need to replace the mark with his own. He should be feeling over the moon, but that wasn't the emotion plaguing him. With one bite, he had done exactly what Mark had done. Force his mark on her due to jealousy.
"You didn't struggle," he said, knowing he sounded a little mystified. He hadn't expected Natalie's Kaged wolf to understand how difficult it was to reign in his beast's instinct when the wolf lived so close to the surface like him. But somehow, she did. And that surprised him.