Oh no. Big black dogs with red eyes? Seras' first reaction will be all "MASTER! 8D!!" and then the fear will get to her. Now, how Seras reacts to fear is a bit different. To start with, she will freeze up and be unable to do anything. Then she usually talks herself out of her fear, or at least talks herself into moving enough to get out of the freaking way.

If things get too badly for her, what's still human inside of her gets shut down and her vampire side takes over, causing her to go berserk. This mostly happens when/if she's overpowered by someone or a large group of someones.

As for moving bones? She'll gladly lend a hand.