This is a toughy. X-rays were not revealing? The way that you are seeing dramatic increasing and decreasing size changes has me thinking that there is a fluid shift responsible for what you are seeing. It's the only thing that I can see changing that quickly. This could be intracellular, like a cellulitis, or extracellular like a serum or blood build-up in damaged tissue. Was a fine-needle aspirate done?

For medications; metacam is available in an injectable form. This might be a more helpfull method of administration.

For your vet, I recommend if they don't already have it, a subscription to www.vin.com. The experts they have on hand are outstanding and can really help out with difficult cases like this.

Other diagnostics that may be of some help would be a biopsy and/or a more helpfull method of imaging the soft tissues of the jaw. MRI or CT scans, or perhaps ultrasound (less likely in this case). Unfortunately these arn't available in a lot of vet clinics.

Good luck!

Ian

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