The Siberian Husky is not a one-person dog. Nor is he a guard dog. He might let you know someone is around, but he has no concept of protecting you. The Siberian is a friendly and gentle dog who is not overly suspicious of strangers or aggressive toward other dogs.
The short answer is yes, it's entirely possible to have RA in your jaw-RA affects joints and your jaw is a joint. In my personal experience, I find jaw pain one of the most difficult to cope with, it's as if it permeates everything, making it impossible to ignore.
Inflammation of joints in RA typically occurs in a symmetrical fashion, in other words, joints on both sides of the body will be affected. The earliest joints to be affected by inflammation in RA are usually the hands (including wrists) and feet. The elbow may also be affected early in the course of the disease and is the site most frequently affected by RA nodules. The shoulder is a common site for RA-related inflammation.