I'd be concerned about a spinal/neck issue since she is having a hard time turning her head. That probably means she is in pain.
Since she is a bit older, the not wanting to put weight on their shoulder area makes me think of arthritis. It's common in large dogs in the shoulder area.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |