even if its an inflammation of a cranial nerve that controls parts of the facial muscles/tongue movement the Pred would help in recovery. Meanwhile dog needs to be fed "mush" diet carefully syringed into the side of her mouth, slowly and in small amounts...water too...to keep her strength up, keep kidneys functioning well (espec. if steroids in use) and allow perhaps 1-2 weeks for the swelling to recede?? Scarey situation for sure. Have the skull x-rays been read by a 2nd opinion-vet?

Lymes is very, very painful. My Mother had it twice and every joint in her body ached. I would think a dog with Lymes would have trouble walking.

The way I understand it, myositis can become so severe that the dog has trouble opening/closing the mouth. To me it seems if this was caused by a tick bite, all the joints would be affected and not just the jaw. I suggest giving the dog prednisone to treat the myo.

"She has some kind of neuropathy that is making her unable to close her jaw that is why she is drooling, the drinking is because her tongue does not curl properly making her try more for less water."