C.L.
Saying "NO hitting!" stearnly and redirecting my son's attention has been working for us. Make sure you stay on top of the hitting the animal thing. Remove her from the situation and say no when she hits at them, they may defend themselves one of these times and who can blame them. Teach her now that the animals are not her jungle gym or toys. I have also used the put the baby off to the side and give attention to the dogs after he hits them-this seems to draw him back in but under nicer terms and he sees me modeling what we want him to do.
Good luck,
C.