Sorry, I missed this post. You will find some very useful information at http://cavalierhealth.org/masticatory_muscle_myositis.htm This is a very reliable site (the webmaster Rob, who is a vet, belongs to this forum and may be able to help you).
If you move your original post down to the 'General Health' section, more people will see it and possibly be able to help from personal experience. This was one post I found by putting Masticatory Muscle Myositis into the Advanced Search box:
Please know this: If your puppy is diagnosed with MMM it is NOT a death sentence! My little girl celebrated her 2[SUP]nd[/SUP] birthday February 17[SUP]th[/SUP], 2014 and she is still with us. She’s happy and fun-loving, with an emphasis on loving! When our breeder heard the news, she immediately offered to take back the 4 month old puppy. It was too late though – we were already hopelessly and helplessly in love. She has had to endure quite a lot, as MMM nearly destroys the immune system, but with a lot of loving care and the most fantastic Veterinarian I’ve ever met, she is doing pretty well. She can’t be around other dogs as she will catch any disease or infection they carry. I never let her walk around a pet store or even the Vet’s office. She overcame an intense bout with mange mites – all dogs and cats have them, but a normal immune system deflects their ill effects easily. She can’t be taken off antibiotics, because the bacteria normal & necessary for digestion will overwhelm her body; the resulting diarrhea will dehydrate and kill her. Her diet must be bland, so I steam brown rice, mash broccoli, and add it to shredded organic chicken. So, don’t despair, but do your homework! If your Vet isn’t willing to listen to you, think “out-of-the-box” on occasion and take a few chances, find one who is.
Sorry that you're having to cope with this - it does sometimes seem that if there is any condition dogs can get, Cavaliers will have it!
:hug:
Kate and Ruby
