I posted a few months ago and attached a picture of my lab, Cooper. His facial bones were protruding and his head was looking as if it was losing muscle. Some of your responses included Masticatory Muscle Myositis. When i mentioned this to the vet i didnt get much response. Well today we saw a different vet at the clinic and he believes that's what Cooper has. He is starting him on 50 mg. of Prednisone twice a day. The vet didnt think any blood tests or other tests were necessary. Has anyone here had any experience with this? Thanks!