my 8 week old silkie is shaking her head. she doesn't normally do this at all. when I say shaking I mean that it's like she has something on her head and she's trying to get it off, she's doing it so often that it's making me think something is wrong. she's eating and drinking fine, only other symptom is that her mouth is open a little. no panting or anything but I'm taking this as a sign that she's congested? I'm worried about her, what do you all think is wrong? what should I do for her?