A separation of a joint would be much worse because a complete separation could require surgery when as a dislocation where once it happens, it will keep happening - it still is not something that would require surgery.
People with lupus, the immune system mistakenly attacks the body's own natural tissues. most of the time immunosuppressives work to downregulate (suppress) this attack by interfering with the synthesis of DNA, the material in the cells that contains the blueprints for all of your genetic information!!
In a study, the independent variable is the thing that you change to see how the change produces different results. In this study, the independent variable would be the use of nicotine.
It would be best to take it to a vet and ask if he has anything on him, or if he is going through some sort of emotional state
It is home!
Hopes this help