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.
It seems strange to think that something that affects a joint in the jaw can lead to anxiety, but TMJ is actually a fascinating disorder, and causes a host of different symptoms that can lead to the development of anxiety. However, it should be noted that TMJ often doesn't cause anxiety-instead, it makes anxiety worse.