It can be either the ball the femur is malformed, or the socket is not deep enough for the ball to fit into. The degree of hip dysplasia varies from slight to severe, and the degree of pain and crippling effect varies as well. It usually worsens with time and there are surgeries that can repair the affected joint much like a human hip replacement procedure. Table Of Diseases Demodectic mites live on all dogs and even us. Don't worry I won't gross you out with microbiology, but this is a very different form of mange than it's much devastating cousin, sacroptic mange.
Sacroptic mange is highly contagious and very unpleasant, and if left untreated it can be fatal.
Demodectic mange is a result of stress on the immune system. It is common for young dogs reaching sexual maturity to have an episode of demodectic mange. It is genetic and is most often presented in a few dime size patches on the head or on the body. It usually is not irritating and should be carefully watched to prevent a secondary infection from forming. Most Bull Terriers who are affected during adolescence will clear up on their own once their body's system get back in order.