[ Arya puts a gentle hand on Nymeria's head before she starts growling and Arya has to admit she has no idea if she can control Nymeria in such close quarters. ]

The adults are much bigger than wolves and strong enough to rip arms and legs off. They can crush bone with their teeth. They've no fear of men like wolves do.

But Nymeria was raised with people. She's never harmed anyone. [ Joffrey does not count as people. ]