What is autoimmune disorder?

I think you meant disease, in which case-

An autoimmune disease is a condition in which your immune system mistakenly attacks your body.

The immune system normally guards against germs like bacteria and viruses. When it senses these foreign invaders, it sends out an army of fighter cells to attack them.

Normally, the immune system can tell the difference between foreign cells and your own cells.

In an autoimmune disease, the immune system mistakes part of your body, like your joints or skin, as foreign. It releases proteins called autoantibodies that attack healthy cells.

Some autoimmune diseases target only one organ. Type 1 diabetes damages the pancreas. Other diseases, like systemic lupus erythematosus (SLE), affect the whole body.

You can find more on Google if needed. Hope this helps! :)

It is a condition when your immune system mistakenly attacks your body

Explanation:

The immune system normally guards against germs like bacteria and viruses. When it senses these foriegn invaders, it starts to attack your body

answer; (c); /out to the side and directly under the dogs neck.