Here's why:
* Autoimmune diseases are caused by the immune system attacking the body's own tissues. This is not something that can be spread from one dog to another.
* Contagious diseases are spread through direct contact, airborne particles, or bodily fluids. Autoimmune diseases don't work that way.
* Genetics and environmental factors play a role in autoimmune diseases. While there may be some breeds that are predisposed to certain autoimmune diseases, there is no evidence that these diseases can be passed from one dog to another.
Important Note: While autoimmune diseases themselves are not contagious, it's important to keep your dog's immune system healthy to prevent other potential infections that could be contagious.