My Dobie is starting to crack her jaw EVERYTIME she yawns now,,,,, and the sound is loud!!! is this something I should be concerned about? I have visions of her putting it out of joint and having to take in this 70 lb dog with a gaping open mouth to the vets,,,,, a funny mental image or what??!!!

She is 2 now and has been cracking it for the past 2 weeks or so,,,,, I am seeing the vet this friday for her nails and such,, maybe I ought to ask??