Thanks Tallyho I've just been reading up on selenium and vitamin E difficiency and I think you might be onto something, it also points to thyroid issues too, I'm going to discuss this with the vet as they want him to go on thyroxine to help with his EMS and PPID :)
We've been in touch with a specialist but no joy :(
Keep doing research but seems quite rare......
He's eating ok and seems comfortable which is good
Not sure if the muscle will come back? Have been massaging it but not sure if TENS might help too?
Thanks for your reply
Our vet can not explain and has no suggested treatment, my boy has been xrayed and blood tested and nothing has showed up!
It's just on one side of his face :(